Diver Tests APRIL_v2

1/3/07

Page 106

Telling it as it is

COMPUTER

Uwatec Galileo Sol

+ One step closer to

being a computer that adjusts for your own body function.
+ Easy to use. + Comprehensive

display.

- Youll have to wait

for a trimix model.

THERE HAVE BEEN SOME BIG CHANGES in Uwatec products since dynamic young Italian Sergio Angelini became boss of the Swiss diving computer arm of Scubapro. Sergios love of diving is second only to his love of big bikes. With three dozen other journalists from diving magazines worldwide, I trekked over to the super-modern factory near Zurich for the launch of what he had promised would be a remarkable step forward in diving computer design. Made in Switzerland still means something here. In an age of out-sourcing to the Far East, it was refreshing to see that this company still employs Swiss staff in a clean, hi-tech factory set in a pretty valley. Sergio and I have been on liveaboard trips together. Detecting that I looked daunted during his comprehensive technical description of the all-new Galileo Sol, on my departure he discreetly thrust a pre-production example into my hand. This meant that I would probably be the first diving writer to subject the unit to real, in-water, extensive testing. In fact, the Galileo Sol proved not at all daunting. It is menu-driven, has three buttons and is as easy to set up and use as a mobile phone. The instruction manual, written by someone who both writes manuals and dives, is relevant and understandable. THE TROUBLE WITH COMPUTERS is that they all work out decompression assuming that you are the standard diver the physiologist assumed you were when the algorithm was written with a number of theoretical tissue models. However, people vary in height and weight and how can a computer know whats going on inside your body? As a first step, Uwatec introduced the adaptive ZH-L8 ADT algorithm, which took into account water temperature. I had trouble with this idea, because a diver properly dressed in a warm drysuit and undersuit in cold water will be warmer than one in a 3mm suit shivering in warmer water. However, a cold body does suffer vaso-constriction of the blood supply to the peripheries, and this would slow down off-gassing in those areas. Recently, with its gas-integrated diving computers, Uwatec incorporated the divers breathing rate in the algorithm. But
now it has moved a big step closer to matching computer to diver. In league with Finnish manufacturer Polar, Uwatec has dovetailed its latest computers incoming data with that of a submersible heart-rate monitor that the diver wears around the chest (1). If you use it under a drysuit, you need to make sure that the contact areas are damp never a problem if you have a leaky inflation valve! The Galileo Sol is gas-integrated by radio transmitter, so your breathing-rate can be included alongside tank pressure and remaining gas-time. You can choose whether heart or breathing rate takes precedence in deco calculations, or leave it to go by the worse case of the two or even the opposite. Not only that, but it can be used with up to four tank transmitters three for yourself, in varying nitrox mixes, and another if you want to keep an eye on your buddys gas supply. So the latest Uwatec ZH-L8 ADT MB PMG algorithm can now include water temperature, breathing rate and the divers actual heart rate as it changes during the dive in its calculation of required deco. Its an eight-compartment, adaptive micro-bubble, predictive multi-gas algorithm. If on the dive it displays the message Increased Workload, this implies that no-stop times may be drastically shortened, or deco times increased.

Page 107

The predictive multi-gas algorithm means that you can see at a glance your deco if you were to continue using the gas you are breathing, or the reduced deco times should you change to richer nitrox mixes.

The packaging

With all this technology to package in one unit, the Galileo Sol might have ended up looking as if it was salvaged from a WW2 submarine. The screen does seem enormous, but the Uwatec engineers came up with a slim oil-filled case that could withstand enormous pressures without ill-effects. It is said to go safely to 330m, yet is hardly an imposition to wear. Unlike other oil-filled computers the battery compartment on this one is air-filled, so you can change the batteries cheaply yourself. The chip is reprogrammable over the Internet, too, so it should never become obsolete. An Infrared link means that the program can be downloaded in only six minutes. Set-up mode is accessed via the three buttons. Enter personal details that come up if the worst happens up to 20 lines of characters. You can even put in useful messages such as Is It Time For Lunch? or Can You Remember How To Get Back To The Shot?. This type of display means that important warnings also come up as words, not just beeps and flashing displays. Youll know whats up instantly, even if you turn off the audible warnings or all the warnings! Text warnings are along the lines of Ascent Too Fast or Max Depth Reached or MOD Exceeded. Bar graphs indicate nitrogen and oxygen loading. You can substitute the oxygen graph for one representing tank pressure. You can personalise everything by interfacing the Galileo with your PC via SmartTrak. Under water, it can display actual and predicted dive profiles, a tissue-loading graph and even maps and simple pictures (such as a diagram of the wreck you are diving) downloaded from your PC.

Displays

You can use any of three screen formats under water Full information (2), the Classic display (3) with bigger but fewer figures, or the basics. Pushing the centre button accesses more information by going up one level of display, so whichever the display, you can access any information you want on the dive. The Sol version of the Galileo is for multi-gas use. Radiolinked to your tanks via up to four transmitters, it will display remaining gas time (from a chosen tank) or remaining no-stop time, whichever is the lesser. Gas-integration means that it can show actual tank pressure as well as remaining gas time, plus

a three-minute warning and 1 your planned tank reserve, as well as being sensitive to your breathing rate. On reaching your planned reserve, the unit informs you and shows the tank information as white on black. All displays that might require immediate action are reversed out in this way. The predictive multi-gas algorithm accounts for time on alternative gases. Under water, the Galileo gives a summary table of deco for all the gases you might be carrying, and total ascent times. The displayed remaining bottom time is based on the first tank used, and it recalculates as you go. You have 30 seconds grace to switch over. The gas switches can be programmed in to be automatic, or switched manually during the dive. For those who wish to stay out of deco, the Galileo can activate an optional warning when you have only two minutes of no-stop time left at your current depth. Once into deco, the relevant graphics appear as white on black. Level stops from the micro-bubble settings are black on white as normal, but mandatory deco stops are reversed so that no mistakes are made. The display reads Entering Level Stops. As on some other Uwatec computers that can be set with micro-bubble levels, level stops are optional. But should you miss any, the algorithm simply cascades on to a lower MB setting, adding deco time where needed. In this case it will display MB Stop Ignored, and later read MB Level Reduced. The unit can show you a profile of the dive so far and a profile of what you should be doing. It can also reveal the theoretical tissue-model loadings. The Galileo automatically switches to gauge-mode once you pass 120m. It then displays ascent speed in m/min, and although you can switch gases it shows tank pressures only. Its timer goes into stopwatch mode in hours and minutes.
John Bantin has been a full-time professional diving writer and underwater photographer since 1990. He makes around 300 dives each year testing diving equipment.

Galileo in action

Sergio told me that the Galileo had been subjected to thousands of test dives with divers at the Brothers in the Egyptian Red Sea, so I set off on a Simply the Best safari on Tony Backhursts Tornado Marine liveaboard Hurricane.

Page 108

My initial dives were on a single tank, but backed up by two other computers that were following my actual dive plan, I was able to play at setting a higher percentage of O2 to make the computer think I was going beyond my maximum operating depth, or using air while I was actually using nitrox, in order to see what happened when it went well into stage- decompression. I couldnt discover how to set it up without air-integration. I had intended to simulate a three-tank dive, but that was not to be. It was the same story when I wanted to use it with a regulator that gave no room for the rather bulky transmitter. But with the transmitter and a single tank it paired magically, and the display was easily read. I pre-set the computer for a heart-rate range of 80-150bpm. At depth, even when relaxed, my heart rate was 80bpm, higher than the 50bpm I had recorded in the office. Finning really hard, I got it to 120bpm before the Increased Workload warning came on (4). After I got my suit on, I soon forgot about the heart-rate monitor. THE GALILEO SOL HAS BUILT-IN independent illumination for the LCD screen. I thought the backlight could have been brighter. I had the contrast cranked up when diving at night but still needed a torch to read the Full display. I recommend a Classic screen-setting for night dives. The micro-bubble setting MB2 made the unit even more cautious than the very judicious Suunto RGBM100 running alongside it, so I soon readjusted to MB1. This was better, but once it showed Level Stops Plus Deco (5) I was unsure how much of the total was Level Stops. Checking the projected dive profile graph didnt clarify that, so I hung around at 15m (a rudimentary deep stop) and saw the level stops magically disappear, leaving a short deco-stop at 3m. At one point the Galileo calculated that I had insufficient gas to reach the surface, clearly reading RBT= 0 (6). After that, Tank Depleted came up when I got past the predetermined reserve pressure and MOD Exceeded was unmistakable at depth. (Dont try these things at home!) You can switch between Classic (7) and Full display on demand, check model tissue loading and even examine a profile of your dive so far, with a projected profile for the quickest safe ascent (8). You can have the Safety Stop timer come on automatically in the shallows or activate it manually. Either way, it counts down minutes and seconds in big figures (9). During a long wait at Elphinstone Reef at 6m, when the oceanic whitetips finally appeared I noticed my heart rate slow

to a more normal 60bpm. Obviously the pressure of depth makes my heart beat a little faster. I saw the rate average a steady 90bpm during most parts of every dive. Clearing my ears during a descent caused a peak, and I hit 120bpm getting back into a RIB when some weighty divers perched thoughtlessly on the opposite tube forced me to climb. All this was revealed in one of the alternative diveprofile graphs available, displayed in logbook mode after the dive (10). (There are of course comprehensive diveplanning modes too.) The logbook mode (11/12) gives masses of information in layer after layer, equating to a lot more than time and maximum depth (13).

Conclusion

I found the Galileo Sol to be as comprehensive as any nitrox computer can be and it even has a built-in full-tilt digital compass with a bearing memory that does not need to be calibrated before use. Full-tilt means you can use it effectively while held at any angle, and it was a joy (14). The tilt-free feature is important under water, and this time the computer still displays essential information such as depth, dive time, tank pressure and deco status. No doubt we shall see simpler, less expensive versions, and as we speak Uwatec has commissioned research in Norway to come up with a properly researched table for use with helium mixes. That could put an end to the current guesswork situation in which deco plans developed from old Buhlmann tables in the public domain are extrapolated for use with trimix. The term full-function decompression diving computer has new meaning. Complete with heart-rate monitor and one tank-transmitter, the Uwatec Galileo Sol costs 869. Scubapro, www.scubapro-uwatec.com

SOS mode Stopwatch SURF INT Switch depth

T1, T2, TD TAT

UTC WL

Operating modes

The functions of the Galileo computer can be grouped into three categories, each corresponding to a specic mode of operation: - surface mode: the computer is on the surface. In this mode you can change settings, review your logbook, use the dive planner, see remaining desaturation after a dive, download to PC and much more; - dive mode: the computer is at a depth of 0.8m/3ft or more. In this mode, Galileo monitors depth, time, temperature and performs all decompression calculations; - sleep mode: the computer is on the surface after 3 minutes without operation. Though the computer appears to be turned off completely, it is still active. Galileo checks the ambient pressure once every 60 seconds for uninterrupted monitoring of the environment.
heart rate (see section 2.9.5), the current temperature, the altitude class (in form of a stylized mountain, see section 3.6) and the battery capacity; on the lower row, the tank pressure, the set oxygen concentration, the corresponding MOD and the active MB level setting (see section 2.3.1).
Turning on Galileo and time of day display
To start the computer, press and hold the right button. The screen will briey show the Galileo logo and then switch to the time of day display. If you press the right button, you will skip the start-up picture and go straight to the time of day display. Think of this as the home page of your new dive computer. This is where it all starts. The type of information displayed in surface mode is different depending on whether Galileo has remaining saturation from a recent dive or is completely desaturated. In case of no remaining saturation, the display looks as depicted below. The buttons are marked, from left to right, with MENU, LOG and LIGHT. The top of the display shows as default the Galileo logo, which can be replaced by the rst two lines of the owner information data (refer to section 2.9.6 on owner information). The time of day is shown in the middle of the display. Underneath it, Galileo displays various information: on the top row the
If the computer has remaining desaturation from a recent dive, the upper portion of the screen is replaced with the following information: desaturation time, no-y time, surface interval and CNS O2 (if applicable).
The remaining desaturation time (DESAT) is calculated by the decompression model in the computer. Any dive started while there is remaining desaturation on your computer is considered a repetitive dive, meaning that Galileo accounts for the preexisting nitrogen load in your body. The no-y time (NO FLY) is the time during which an exposure to the reduced pressure

- Diving with Nitrox may only be attempted by experienced divers after proper training from an internationally recognized agency. - Before every dive and after changing the tank, you must make sure that the set oxygen concentration in Galileo corresponds to the oxygen concentration in the tank. Setting the wrong oxygen concentration can lead to serious injury or death.

Dive settings

See section 3.8 for restrictions on setting Galileo from computer mode to gauge mode and vice versa. 2.3.3 Safety stop timer (default: automatic, 3 minutes) The purpose of the safety stop timer is to allow you to monitor your safety stop at the end of the dive. You can set the duration of the safety stop timer between 1 and 5 minutes in one minute increments. You can also set the timer to be triggered automatically or manually or you can turn the function OFF altogether. The operation of the safety stop timer is described in section 3.4.3.
2.3.1 MB level (default: L0) Upon entering this menu, the currently active MB level is displayed. Using the + and - buttons you can change between levels, from L0 (baseline algorithm) to L5 (highest level of added conservatism).
Please refer to section 3.7.1 for instructions on setting the oxygen concentration for tanks T2 and TD.
2.3.4 ppO2max (default: 1.4bar) The value of ppO2max determines your MOD based on your oxygen mix. You can set this value between 1.2bar and 1.6bar or OFF.
Setting the ppO2max value to OFF can result in exposure to high levels of oxygen partial pressure and can result in serious injury or death. 2.3.5 Nitrox reset time (default: no reset) If you set the computer to an oxygen concentration higher than 21% (diving with Nitrox), you can decide whether the computer should revert back to 21% (air) at some point in time or if it should stay set to the given oxygen concentration until you change it manually. This is done via the Nitrox reset time. If you set the Nitrox reset time to NO RESET, the computer will maintain the given oxygen concentration until you change it manually. If you set the Nitrox reset time to any value between 1 hour and 48 hours, the computer will automatically change the oxygen concentration back to 21% after the specied time interval has elapsed.
If you set ppO2max to OFF, you will not get any MOD warnings. If you choose OFF, you will be required to enter an additional conrmation in the form of a safety code. The safety code is 313. This prevents unintentionally setting the ppO2max to OFF. To enter the code, use the + and - buttons to dene the rst digit (3), then press >> to conrm it. Now dene the next digit (1), conrm by pressing >>, then dene the last digit (3). Upon pressing SAVE after having dened the last digit, ppO2max will be set to OFF and you will have no related warnings. The display shows the message ppO2max SET TO OFF SUCCESSFUL for 2 seconds.

Muting all alarms can lead you into potentially dangerous situation and could result in serious injury or death. If you choose ALL-SILENT ON, you will be required to enter an additional conrmation in the form of a safety code. The safety code is 313. This prevents unintentionally
setting the ALL-SILENT to ON. To enter the code, use the + and - buttons to dene the rst digit (3), then press >> to conrm it. Now dene the next digit (1), conrm by pressing >> then dene the last digit (3). Upon pressing SAVE after having dened the last digit, ALL-SILENT will be set to ON and you will have no audible signals of any kind. The display shows the message ALL-SILENT ON SUCCESSFUL for 2 seconds.
Galileo has a tilt-compensated digital compass which can be used at almost any inclination. The compass can be called up at any moment during the dive and it can also be used on the surface. This menu allows you to use the compass on the surface, change the auto-off time and assign a declination to compensate for the deviation between true North and magnetic North.
2.4.1 Using the compass on the surface Upon selecting the USE COMPASS menu, the screen will display the compass, the time of day and the surface interval, if applicable. The buttons are now labeled SET and EXIT. With the middle button (SET), you can set a reference bearing. This is useful for instance if you are on a boat and there is a landmark on the shore that you can use for alignment to reach a specic spot on that dive site. Press SET to set the bearing, and the display shows the message SET BEARING SUCCESSFUL for 2 seconds. A dot will appear to indicate the set bearing. Once underwater, align the dot with the arrow and start swimming in that direction. If you press SET again, the new bearing will override the one in memory. If you press and hold SET you erase the bearing. When you set a bearing, Galileo automatically marks the points at 90, 120 and 180 degrees as an aid in navigation. See section 3.4.1 for more information on using this feature. The right button (EXIT) returns to the main Digital compass menu.
2.3.9 PMG (default: OFF) Galileo can calculate decompression schedules for dives in which up to three Nitrox mixes are used (PMG stands for Predictive Multi Gas). This adds signicant complexity to the interface, so for increased ease of use for single gas dives, with this option you can quickly turn Galileo into a single gas computer (without erasing any of the settings you may use for multi gas diving).
2.4.3 Setting the declination (default: 0 degrees) Depending on the exact location on the planet, there can be a deviation between true North and magnetic North. Any compass will always show magnetic North, so via this menu you can set a value for the so-called declination that will make the compass show true North instead. 2.4.2 Setting the auto-off time (default: 15 seconds) While diving, the compass lay-out replaces the main dive computer screen conguration when the right button is pressed and held. When in compass mode, Galileo uses more battery energy than normal, so it is desirable to have the computer switch back to the regular conguration after a certain time interval. This menu allows you to set this time interval between 5, 10, 15, 30 and 60 seconds or to PUSH ON/PUSH OFF. In this last setting, the compass lay-out remains on the screen until you press and hold the right button to revert to the regular dive computer screen conguration. NOTE: - If a warning or an alarm is triggered while in compass mode, Galileo switches back to the regular lay-out regardless of the auto-off setting. - If Galileo is in compass mode when it enters level stops or decompression, it also switches back to the regular lay-out regardless of the auto-off setting.

as alternate information). You can choose to have Galileo warn you when you are about to enter a decompression obligation while diving with an active MB level higher than L0.
During the dive, if the underlying L0 no-stop time reaches 2 minutes and the warning is set to either VISUAL or BOTH, Galileo will show the message L0 NO-STOP = 2 MIN on the display for 12 seconds. The following gures show the actual display in the CLASSIC and FULL congurations.
During the dive, if you are about to enter decompression and the warning is set to either VISUAL or BOTH, Galileo will show the message ENTERING DECO AT L0 on the display for 12 seconds. The following gures show the actual display in the CLASSIC and FULL congurations.

Clock settings

2.6.13 Entering deco when diving an MB level When diving with an MB level higher than L0, the underlying L0 information is not directly visible on the display (though it is accessible

2.7.1 Wake-up alarm

Other settings
This menu allows you to set a wake-up alarm. The time of the alarm is shown in the format specied in the Time menu (either in AM/PM or 24hour). When the alarm is set to ON, a bell symbol appears in the time of day display. 2.7.2 Time This menu allows you to set the time format, time and date.
2.8.1 Device information This menu displays the device ID number (ID), the hardware version (HW), the software version (SW), the battery level and the ASIC version. Press EXIT to exit this submenu and return to the Other settings menu.
Pressing SAVE at the last setting starts the clock at the set time and zero seconds. 2.7.3 Time zone (UTC) This menu allows you to easily change the time when traveling to other time zones. Instead of changing the actual time itself, in this menu you can dene a number of hours to add to or to subtract from the currently displayed time so as to get the correct time at your travel destination. 2.8.2 Gas integration (default: 40bar/ 600psi, ALARM, normal, OFF)
In this menu you can set the tank reserve used for the RBT calculation, you can choose whether the RBT = 0 minutes should be an alarm or just a warning (applies to dives with more than one gas mixture only),
The range of the UTC setting is between -13hours and +13 hours in 15 minute increments.

for 12 seconds and during this time the audible signal goes off. In addition, the RBT information is displayed in inverted colors (white on a black background). The audible signal does not stop unless the RBT grows to 1 minute or more, or if the depth is 6.5m/20ft or shallower.
Additionally, for all congurations, if the tank pressure reaches the specied tank reserve, the message TANK RESERVE REACHED is displayed on the screen for 12 seconds and the tank pressure information is displayed in inverted colors (white on a black background). 3.2.6 Low battery
In LIGHT conguration, the alarm message RBT = 0 MIN is displayed in place of the no-stop information for 12 seconds and during this time the audible signal goes off. In addition, after the text message extinguishes, the RBT is displayed in inverted colors (white on a black background) in the lower right corner. The audible signal does not stop unless the RBT grows to 1 minute or more, or if the depth is 6.5m/20ft or shallower. Do not start a dive if the REPLACE BATTERY message is displayed on the screen on the surface. The computer may fail to function during the dive and this could lead to serious injury or death. During the dive, Galileo alerts you of precarious battery situations in two ways: - By displaying LOW BATTERY on the screen. This means you can nish the dive but you should replace the battery once you return to the surface; - By displaying REPLACE BATTERY on the screen. This means you need to start the procedure to terminate the dive, as there is not enough energy in the battery to ensure proper continued functioning and the computer may fail. During a REPLACE BATTERY alarm, the backlight cannot be activated, the audible warnings and alarms are not available anymore and the compass cannot be activated.
In FULL conguration, the alarm message RBT = 0 MIN is displayed in place of the no-stop or decompression information
In a LOW BATTERY situation, the message is displayed at the bottom of the screen in 4-second intervals. In LIGHT screen conguration, the display switches to CLASSIC to allow for all the relevant information to be shown.

In addition to monitoring the status of its own battery, Galileo also monitors the status of the battery in transmitters T1, T2 and TD and alerts you when a battery is low and should be replaced. The message T1 (or T2 or TD) BATTERY LOW is displayed on the middle row of the screen in 4 second intervals. In LIGHT screen conguration, the display switches to CLASSIC to allow for all the relevant information to be shown.
If the REPLACE BATTERY message appears during the dive, start the procedure to terminate the dive, as the computer may fail. Do not let the battery reach this condition! In a REPLACE BATTERY situation, the message is displayed on the bottom of the screen in 4-second intervals. In LIGHT screen conguration, the display switches to CLASSIC to allow for all the relevant information to be shown.

Display information

Upon immersion, the water contacts will automatically activate Galileo, unless they have been turned OFF. In this case, you must activate the computer manually before starting the dive. See section 2.8.6 for more information. At a depth of 0.8m/3ft, Galileo starts to monitor depth and time and also to perform decompression calculations.
Details on the information displayed can be found in the next sections. 3.3.1 Description of entries This section complements the information listed in the Glossary by adding specic details about Galileos screen while diving. The dive time is displayed as dive time in minutes. If during the dive you ascend to the surface, the time spent on the surface will only be counted if you descend again below 0.8m/3ft within 5 minutes. This allows for brief periods of orientation. While on the surface, the time will not show as progressing but it is running in the background. As soon as you submerge, the time will resume, including the time spent on the surface. Maximum displayed time is 999 minutes for CLASSIC and FULL congurations and 99 minutes for LIGHT conguration. For dives longer than that, the dive time starts again from 0 minutes. Depth: the depth is given in 10cm resolution until 99.9 meters, after which it is given in 1m resolution. When the depth is displayed in feet, the resolution is always 1 foot. At a depth shallower than 0.8m/3ft, the display shows ---. Maximum possible depth is 330m/1084ft. At depth greater than 1000ft, the leading 1 is not shown, so 1084ft will be displayed as 084ft.

During all dives, perform a safety stop between 3 and 5 meters/10 and 15 feet for 3 to 5 minutes, even if no decompression stop is required. Temperature: Galileo displays the water temperature during the dive and the air temperature on the surface. RBT: The RBT (remaining bottom time) is the time you can spend at the current depth and still have enough gas supply to make a safe ascent and reach the surface with the tank reserve. The RBT calculation is based on your current breathing rate, accounts for any existing and upcoming decompression obligation and for any temperature gradient in the water. It assumes an ascent at the ideal ascent rate (dened in section 3.2.1). When the RBT reaches 0 minutes, it means that Galileo has computed that if you start your ascent now and ascend at the ideal ascent rate, you will arrive at the surface with just the tank reserve, and any further delay increases the risk that you run out of gas supply before reaching the surface. NOTE: - Galileo needs approximately 2 minutes to analyze your breathing pattern, thus the RBT is not displayed during these rst two minutes. - When you are close to the depth of the deepest mandatory decompression stop, the RBT indicates the time you can stay at that depth before reaching the tank reserve. Tank pressure: based on the signal from the Smart transmitter. The Smart transmitter has a range of 1.5m/5ft. Unlike other UWATEC gas integrated dive computers, this value is not temperature compensated. Temperature compensation is still performed to ensure a correct RBT calculation, but the uncompensated value is displayed.
Galileo functions as a decompression computer to a depth of 120m/394ft only. At depths deeper than 120m/394ft it will automatically switch to gauge mode and it cannot be used as a decompression computer for the remainder of the dive. To alert you of the imminent switch, at depths between 115m/377ft and 120m/394ft Galileo displays the message SWITCHING TO GAUGE. No-stop time: calculated in real time and updated every 0.5 seconds. Maximum displayed no-stop times are 199 minutes for CLASSIC and FULL congurations and 99 minutes for LIGHT conguration.
- If Galileo receives no signal from the transmitter for 30 seconds, an audible sequence goes off and the message NO PRESSURE SIGNAL appears on the display for 12 seconds. - If after another 40 seconds Galileo still has not received any signal from the transmitter, another audible sequence goes off and the message PRESSURE SIGNAL LOST appears for 12 seconds, after which the RBT is not displayed any longer and the tank pressure is replaced with - - -. Check the position of Galileo with respect to the transmitter. Start ascending if you dont get a tank pressure reading. - If you set PRESSURE SIGNAL to OFF in section 2.6.8, you will not get these warnings. In such case it is very important that you constantly monitor the tank pressure to avoid a low gas supply situation. - If the tank pressure reaches 14bar/200psi, the transmitter will turn off and Galileo will not show tank pressure any longer. Buddy tank pressure: if your dive buddy also uses an UWATEC Smart transmitter, you can pair its signal to the BUDDY tank designation in your Galileo. Then, as long as you are within 1.5m/5ft of your buddys transmitter, you can see the corresponding tank pressure on the screen of your Galileo. Oxygen bar graph: This is the bar graph on the left side of the display (CLASSIC and FULL congurations) and it represents oxygen toxicity. The bar graph is made of ten segments. The rst segment lights up at a CNS O2 value of 5%, all other segments light up in 10% increments thereafter. At eight segments the CNS O2 value corresponds to 75%, for which a warning can be triggered (see section 2.6.2). At 95% all segments are lit. At 100% the CNS O2 alarm is triggered.

Microbubbles are tiny bubbles that can build up inside a divers body during any dive and normally dissipate naturally during an ascent and on the surface after a dive. Dives within no-stop time and observance of decompression stops do not prevent the formation of microbubbles in the venous blood circulation. Galileo has been equipped with an enhanced UWATEC algorithm, named ZH-L8 ADT MB, to reduce the formation of these microbubbles. This enhanced algorithm allows the user to choose a level of conservatism over and in addition to the worldwide proven safety record of the standard ZH-L8 ADT algorithm. There are ve levels of added conservatism (or MB levels), from L1 to L5, with L5 being the most conservative and L1 being just a bit more conservative than the standard ZH-L8 ADT, here referred to as L0. Choosing an MB level between L1 and L5 makes the algorithm more conservative, therefore the diver will have either shorter no-stop times or deeper and longer decompression stops (referred to as level stops) than when diving with L0. Consequently the body will either take up less nitrogen (shorter no-stop dives) or will be able to offgas more before returning to the surface (dives with level stops). Both work towards reducing the amount of microbubbles present in the body at the end of the dive. Please refer to section 2.3.1 for information on setting the MB level.
3.5.1 MB Glossary Deco stop: decompression stop as requested by L0; mandatory. L0: baseline algorithm corresponding to ZH-L8 ADT. L1: rst and lowest level of added conservatism. L2: second level of added conservatism. L3: third level of added conservatism. L4: fourth level of added conservatism. L5: fth and highest level of added conservatism. Level stop: decompression stop as requested by active MB levels L1 through L5; not mandatory. Reduced level stop: decompression stop as requested by new active MB level, after an MB level reduction has taken place due to violation of level stop requirement. ZH-L8 ADT: UWATECs adaptive 8-tissue algorithm. ZH-L8 ADT MB: UWATECs adaptive 8-tissue algorithm with MB levels (added conservatism).
3.5.2 Display information When diving with an MB level other than L0, Galileo still carries out all calculations relating to L0 in the background. To understand the relation between set MB level and the underlying L0 calculation and how the information appears on the display, we shall use the example of a dive with MB L3 set in the dive computer.
Situation L3 information L0 information Display details on display in background No-stop Level stop No-stop No-stop Display shows L3 no-stop time. L0 no-stop time can be called up by pressing MORE. Display shows L3 level stop information. The L3 information is in black on white background because L0 is still in no-stop time. Stop is described as LEVEL STOP. L0 no-stop time can be called up by pressing MORE. Display shows L3 level stop information. The L3 information is in white on a black background because L0 is also in decompression. The stop is described as LEVEL STOP because the stop depth relates to the L3 level only. L0 decompression information can be called up by pressing MORE. Display shows L3 level stop information. The L3 information is in white on a black background because L0 is also in decompression. The stop is described as LEVEL+DECO STOP because the stop depth is the same for L3 level and for L0. The TAT (total ascent time) refers to L3 level stop, so as the DECO STOP obligation is met, the description of the stop depth changes from LEVEL+DECO STOP to LEVEL STOP only. L0 decompression information can be called up by pressing MORE.

- Diving with more than one gas mixture represents a much higher risk than diving with a single gas mixture, and mistakes by the diver may lead to serious injury or death. - During dives with more than one gas mixture, always make sure you are breathing from the tank that you intend to breathe from. Breathing from a high oxygen concentration mix at the wrong depth can kill you instantly. - Mark all your regulators and tanks so that you cannot confuse them under any circumstance. - Before each dive and after changing a tank, ensure that each gas mixture is set to the correct value for the corresponding tank. Galileo enables you to use up to three gas mixtures during the dive (air and Nitrox only). The three mixtures are labeled T1, T2 and TD
Galileo can show the tank pressure of each tank if the corresponding rst stage regulator is equipped with an UWATEC Smart transmitter, paired as described in section 1.11. Note that Galileo can be programmed and used for diving with more than one gas mixture whether you use transmitters or not. 3.7.1 Setting the oxygen concentration when diving with more than one gas mixture To set the oxygen concentration for tanks T1, T2 and TD you need to access the O2 setting menu as described in section 2.2. The look of the menu, however, changes slightly when PMG is set to ON in that the rst line now shows the tank designation and the word ON or OFF next to it.
While TANK is highlighted, use the - and + buttons to choose the tank for which you want to set the oxygen concentration. Press >> to highlight ON or OFF, and use the - and + buttons to toggle between the two. Press >> again to move down one line to the oxygen concentration. After setting the oxygen concentration, pressing >> moves you down one line to the ppO2max. Note that the MOD for tanks T2 and TD is actually the switch depth that Galileo will use for its calculations, warnings and suggested gas switch point. Press SAVE to save your settings. NOTE: - Galileo considers in its algorithm only gas mixtures whose tanks are set to ON in the O2 settings menu. - The oxygen concentration of T2 can only be set after having set the oxygen concentration of TD. - Setting the ppO2max value to OFF applies to tank T1 only. Tanks T2 and TD are always limited to a maximum value of ppO2max of 1.6bar. - For oxygen concentrations of 80% and higher, the ppO2max is xed at 1.6bar and cannot be changed. - The oxygen concentration of T1 cannot be set to OFF. - The oxygen concentration of T2 can only be set to a value between that of T1 (equal or higher) and TD (equal or lower). - Galileo adds the label T1, T2 or TD next to the O2 label and between the tank pressure and RBT labels to identify the currently active tank. - The ON/OFF option for each tank allows you to easily go from 3 to 2 or even to 1 gas mixture without changing the actual oxygen settings. - If you set tank TD to OFF, T2 will automatically be set to OFF also. - The MOD for tanks T2 and TD is the switch depth for the corresponding gas. This is what Galileo uses for its calculation, alarms and suggested switch points.

- Galileo does not allow MODs of different gases to be less than 3m/10ft apart. - Setting a tank to OFF does not affect the pairing of the corresponding transmitter. - When diving with more than one gas mixture, the Nitrox reset time function (described in section 2.3.5) has the following effect: o T1 is set to 21% o T2 and TD are set to OFF. 3.7.2 Gas summary table When more than one gas mixture is set, Galileo can display a gas summary table, listing the tank pressure, oxygen concentration, ppO2max and MOD for each tank. If a tank designation has not been paired, NO P appears instead of the pressure. If the tank designation has been paired but Galileo is not receiving a signal, --- appears instead of the pressure.
The gas summary table is visible both on the surface and during the dive. On the surface it allows you to review your settings and, if the transmitters for all tanks are in range and have not turned themselves off to preserve battery life (see section 1.11), it allows you to verify the pressure in each tank. To bring up the table, press and hold the middle button (marked LOG) from the time of day display. Pressing the middle button once the table is displayed brings you into the picture viewing function. During the dive, the gas summary table is useful to remind you at what depth you planned to perform the gas switch(es) and also to verify again the pressure in each tank (provided that the transmitters are in range and are active). To bring up the table, press and hold the middle button
(marked MORE). The gas summary table stays on the display for a maximum of 12 seconds, after which Galileo reverts to the regular computer display. Pressing the middle button while the gas summary table is displayed brings up the deco summary table, explained in the next section. 3.7.3 Deco summary table Galileo shows you the predictive multi gas decompression calculation on the main computer screen. However, in the background it is also calculating what the decompression would be if you were to nish the dive with just the gas mixture that you are currently breathing from. If you are diving with an MB level higher than L0, Galileo also computes both the predictive multi gas decompression calculation and the current gas only calculation for L0. All these calculations are shown at once in the deco summary table.
The deco summary table stays on the display for a maximum of 12 seconds, after which Galileo reverts to the regular computer display. Pressing the middle button while the deco summary table is displayed brings up the dive prole, as described in section 3.4.4. In the case of dives with more than one mixture, Galileo adds a solid line indicating the MOD for the various gas mixtures. The vertical line then represents the predicted time and depth of the switch.
3.7.4 Switching gas mixture during the dive During the ascent phase, when you reach a depth corresponding to the MOD of T2 or TD, Galileo will suggest that you perform the switch. An audible sequence goes off, and the message SWITCH TO GAS T2 (or TD) appears on the display. Simultaneously, the labels of the left and middle buttons change to SAVE and >>, respectively. You have 30 seconds to respond to this message, else Galileo will consider that tank T2 (or TD) never existed and adapts the decompression schedule accordingly. You can: - Press or press and hold SAVE to conrm the gas switch. - Press or press and hold >> to choose the next gas in sequence, after which you would still have to press or press and hold SAVE to conrm the switch. - Press and hold the right button to terminate the gas switch procedure without carrying out any switch.

Always make sure you are switching to the intended gas. Failure to do so may result in serious injury or death. If you conrm the switch, the message SWITCH TO GAS T2 (or TD) SUCCESSFUL appears on the display for 4 seconds. If you exit without conrming the switch, the message EXCLUDING GAS T2 (or TD) appears for 4 seconds.
3.7.5 Special situations 3.7.5.1 Switching back to a gas mixture with lower oxygen concentration There may be situations in which you have to switch back to a gas with lower oxygen concentration than what you are currently breathing. This can happen for instance if you want to descend deeper
3.7.5.4 Manual gas switch at a depth deeper than its MOD There may be situations in which you have no other choice but to switch to a different gas mixture although you are below the MOD for that mixture. Galileo does not prevent you from doing this, but the MOD alarm will immediately go off. NOTE: NOTE: If after Galileo has changed the decompression schedule to reect the missed gas switch, you descend again below the MOD for the gas mixture you did not switch to, Galileo reintroduces that gas into its calculations and the decompression schedule changes accordingly. This is accompanied by the display message INCLUDING T2 (or TD) AGAIN for 4 seconds. It is not dangerous to switch the computer to a gas mixture below its MOD, but rather it is dangerous to breathe a gas mixture below its MOD. Galileo alerts you of the imminent danger when you do so. 3.7.5.5 Submerging below the MOD after a gas switch If after having switched to a gas mixture with a higher oxygen concentration you inadvertently drop again below the MOD for that mixture, the MOD alarm will immediately go off. Either switch back to a gas mixture suited for that depth, or ascend above the MOD for the gas mixture you are breathing from. 3.7.6 RBT when diving with more than one gas mixture Galileo determines the RBT based on your breathing pattern. The tanks with the various gas mixtures you have with you may be of different sizes, therefore the RBT calculation cannot be extended to all tanks at once since your breathing pattern will be different for each tank. Since Galileo performs several decompression calculations simultaneously for all possible combinations of gas mixtures, the RBT calculation references the decompression calculation that considers only the gas you are currently breathing from. - If you have programmed 2 or 3 gases and are currently breathing from T1, the RBT will be for the decompression schedule that considers T1 only. - If you have programmed 3 gases and are currently breathing from T2, the RBT will be for the decompression schedule that consider T2 only.

- Polar T31 Coded Transmitter: 2500 hours of use. The transmitter is activated by moisture, so leaving it on a wet towel for instance will consume battery power. If you suspect that the battery has run out, please contact an authorized Polar Service Center for a replacement transmitter. Polar recycles used transmitters.

Maintenance

The tank pressure gauge and the parts of this product used to measure tank pressure should be serviced by an authorized SCUBAPRO UWATEC dealer every other year or after 200 dives (whichever comes rst). In addition, the depth accuracy should be veried every two years. Aside from that, Galileo is virtually maintenance free. All you need to do is rinse it carefully with fresh water after each dive and change the battery when needed. To avoid possible problems with your Galileo, the following recommendations will help assure years of trouble free service: - avoid dropping or jarring your Galileo - do not expose Galileo to intense, direct sunlight - do not store Galileo in a sealed container, always ensure free ventilation. If there are problems with the water contacts, use soapy water to clean Galileo and dry it thoroughly. The housing of Galileo can be treated with silicone grease, but do not apply silicone grease to the water contacts! - Do not clean Galileo with liquids containing solvents. - Check the battery capacity before each dive. - If the battery warning appears, replace the battery. - If any error message appears on the display, take Galileo back to an authorized SCUBAPRO UWATEC Dealer. The Polar T31 Coded Transmitter is a high tech instrument and should be treated with care. The following recommendations will help you fulll the warranty obligations:
- Store it in a cool and dry place. Do not store it in a damp environment, in nonbreathable material (such as a plastic bag) or with conductive material such as a wet towel. - Keep it clean: use a mild soap and water solution, and dry it with a soft towel. Never use alcohol or any abrasive material such as steel wool or cleaning chemicals. - Keep it out of extreme heat and extreme cold. Operating temperatures are -10C to 50C/14F to 122F. - Do not expose it to direct sunlight for extended periods, such as by leaving it in a car. - Do not bend or stretch the transmitter, as this may damage the electrodes. - Do not dry it with anything other than a soft towel. Mishandling may damage the electrodes 5.2.1 Replacing the battery in Galileo
We recommend having the battery of Galileo replaced by an authorized SCUBAPRO UWATEC dealer. The change must be made with particular care in order to prevent water from seeping in. The warranty does not cover damages due to an improper placement of the battery. Galileo stores the tissue saturation information in non-volatile memory, so the battery can be replaced at any time between dives without loss of information. Procedure: To replace the battery you need a coin or the dedicated tool that came with Galileo and a clean cloth.

3. Inspect the o-ring on the battery cap. If you see traces of seeping water, damages or defects on the o-ring, replace the o-ring with an original UWATEC replacement part (PN 06.202.693). The o-ring is provided with the UWATEC battery kit for Galileo (PN 06.202.872). When replacing the o-ring, make sure the new o-ring is in perfect condition and well lubricated, and that the o-ring, o-ring groove and sealing surfaces are free of dust and dirt. 4. Remove the old battery and dispose of it in an environmentally friendly way. 5. Check the polarity of the new battery. Galileo can be damaged if you do not insert the battery correctly. Insert the battery so that the + side is pointing out of the battery case. 6. Screw the battery cap back in place. Turn the cap until it is ush with the surface and the slot on the battery cap is aligned with the mark on the housing. Damage to Galileo due to improper placement of the battery cap is not covered by warranty.
- A leaking battery cap may lead to the destruction of Galileo by water seeping in or cause Galileo to switch off without prior notice. - Always open the battery compartment in a dry and clean environment. - Only open the battery compartment to replace the battery.
7. Check Galileo by turning it on.
1. Dry Galileo with a soft towel. 2. Unscrew the battery cap using a coin or the dedicated tool.
NOTE: - After a dive, Galileo stores tissue saturation data once an hour while on the surface until it is completely desaturated. If you change the battery while Galileo has remaining desaturation time, the tissue data will not be lost, but Galileo will reference the last stored data set. As a consequence, the data displayed on the surface screen after the battery change (desaturation time, surface interval, no-y time and CNS O2) may be different from the values displayed just prior to the battery removal. - After replacing the battery, you must set the date and time. 5.2.2 Replacing the battery in the Smart transmitter
1. Remove the transmitter from the HP port of the rst stage regulator. 2. Dry the transmitter with a soft towel. 3. Remove the 3 screws with a Phillips screwdriver. 4. Carefully remove the transmitter cap. 5. Carefully remove the transmitter cap o-ring. Be careful not to damage the sealing surfaces. 6. Remove the battery by holding it on both sides. Do not touch the contacts or the electronic parts.