TABLE OF CONTENTS

CHAPTER 1 INTRODUCING THE GARMIN GPS 75 1.1 Capabilities 1.2 Operations 2 GETTING STARTED 2.1 2.2 2.3 2.4 2.5 2.6 2.Front Panel Softkey Operation Cursor and Fields Keypad Operation Entering Data Viewing Messages Operating Modes PAGE 1-1 1-1 1-2 2-1 2-1 2-1 2-2 2-2 2-4 2-4 2-5 3-1 3-1 3-2 3-3 3-5 3-6 3-6 3-7 3-8 3-11 3-11 4-1 4-1 4-2 4-3 4-4 4-4 4-5 4-5 iii
BASIC OPERATION 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 Power On Satellite Status Pages Present Position Waypoints Waypoint List Autostore TM Getting There Fast--GOTO Navigating To A Waypoint Man Overboard Sample Trip
ROUTES 4.1 4.2 4.3 4.4 4.5 4.6 4.7 Navigating Using Routes Creating and Copying A Route Activating Routes Editing Routes Deleting Routes Active Route Route List
ADVANCED WAYPOINT FEATURES 5.1 5.2 5.3 5.4 Nearest Waypoints Proximity Waypoints Reference Waypoints Waypoint Scanning
5-1 5-1 5-1 5-2 5-3 6-1 6-1 6-2 6-3 6-4 6-5 6-6 6-6 6-7 6-8 6-9 6-10 6-11
AUXILIARY FUNCTIONS 6.1 6.2 6.3 6.4 6.5 6.6 6.7 6.8 6.9 6.10 6.11 6.12 Operating Mode and Filters Plotting Setup Units/Heading Setup Alarms and CDI Setup Date/Time Audio and Display Setup Interface Setup Map Datum Selection Beacon Receiver Setup Sunrise/Sunset Planning Trip & Fuel Planning Messages

APPENDICES

A B MESSAGES GLOSSARY AND NAVIGATION TERMS B.1 Definitions B.2 Course To Steer (CTS) C INSTALLATION AND MAINTENANCE C.1 C.2 C.3 C.4 C.5 C.6 C.7 D E iv Specifications Electrical Wiring Universal Mount Installation Universal Mount Operation Battery Pack Operation Maintenance Product Support A-1 B-1 B-1 B-3 C-1 C-1 C-3 C-5 C-8 C-10 C-11 C-12 D-1 E-1
MAP DATUMS LOCAL TIME TO UTC TIME OFFSET

CHAPTER 2

GETTING STARTED

2.1 FRONT PANEL

Page Options Page Annunciator Softkeys

Message Annunciator

PWR STAT GOTO MOB AUTO STO

ABC 1 JKL 4 STU 7

DEF 2 MNO 5 VWX 8

GHI 3 PQR 6 YZ 9

The front panel consists of a 20-key keypad with a 85 x 64-pixel LCD display. Both the display and keypad may be illuminated for nighttime operation. 2.2 SOFTKEY OPERATION
Information displayed on the LCD is commonly referred to as a page. The GPS 75 works with softkey operation. At the bottom of the screen is a list of page options. To select a different page, press the appropriate softkey below the desired menu option. Please note that the menu options must be highlighted in order to use the softkeys. On the bottom line, extreme right, is the page annunciator, which indicates the current page you are viewing.
CURSOR AND FIELDS Confirmation Field Bar Field

Cyclic Field

The area of the page which is highlighted in reverse video is called the cursor. The cursor may be moved to locations on the page called fields which allow you to enter data or change options. You will encounter five types of fields. Numeric fields accept numbers only. Alphanumeric fields accept numbers as well as letters. Cyclic fields allow selection from several available options. A cyclic field is preceded by a prompt ( ). You may cycle through the choices by pushing CLR. Confirmation fields allow you to indicate your approval. For example, you will be asked to confirm that you want to delete a waypoint. Confirmation fields always end with a ? character. Press ENT to approve the confirmation field. Bar fields allow an adjustable scale entry with the length of the bar representing the minimum to maximum setting. Use your arrow keys to make adjustments in bar fields. 2.4 KEYPAD OPERATION The PWR/STAT key is a dual function key that controls unit power and system status. Pressing this when the unit is off will turn the unit on. To turn the unit off, press and hold PWR/STAT until the display is blank. Pressing PWR/STAT momentarily while the unit is on will take you to the status pages (see Section 3.2). If the message annunciator is flashing and the tone sounds, you may push PWR/STAT to view the message.
Pressing GOTO/MOB once allows you to initiate the GOTO function, setting an instantaneous course to any waypoint (see Section 3.7). Pressing GOTO/MOB twice allows you to initiate the Man Overboard function, setting an immediate course to the captured position (see Section 3.9). Pressing AUTOSTORE allows you to capture your present position instantaneously (see Section 3.6). Pressing NAV selects the Navigation Pages which allow you to view navigation information and the Plot Page (see Section 3.8). Pressing WPT selects the Waypoint Pages which allow you to create, edit, delete, and rename waypoints. In addition, you may view nearest waypoints or proximity waypoints (see Sections 3.4, 3.5 and Chapter 5). Pressing RTE selects the Route Pages which allow you to edit, review, activate, and delete routes (see Chapter 4). Pressing either of the arrow keys allows you to move the cursor, scroll through information lists, and enter letters of the alphabet. The alphanumeric keys allow you to enter letters and numbers. Use the arrow keys to select the desired letter or number. Pressing this key while the cursor is not on a numeric or alphanumeric field allows you to change the backlight level. There are two backlighting levels. Pressing CLR erases information in the cursor field. If the cursor is over a cyclic field, pressing CLR will toggle through several available options. Pressing ENT confirms an entry or selection.

CHAPTER 3

BASIC OPERATION

3.1 POWER ON

After you turn your GPS 75 on, it will conduct a series of self tests and display the following notice:
Following completion of the tests, the Satellite Bar Graph Page (see Section 3.2) will be displayed, and the GPS 75 will begin acquiring satellites. After a position is found (and if no keys have been pressed), the Position Page (see Section 3.3) will be displayed, and the unit is ready for normal operation. When four or more satellites with good geometry are available, the GPS 75 will automatically operate in the 3D mode in which latitude, longitude, and altitude are computed. If only three satellites are available, the unit will operate in 2D mode in which only latitude and longitude are computed. When operating in the 2D mode, the unit will use the last computed altitude or your last entered altitude. (Section 3.3 describes how you may enter the altitude.) Your GPS 75 will automatically update satellite orbital data as it operates. If you have not operated your unit for a period of six months or longer, it will take approximately 15 minutes to search the sky and collect new orbital data. You will be informed when your unit is searching the sky with the message Searching the Sky. Once satellite orbital data is collected, it will be stored in memory. The memory is maintained by an internal battery, therefore the data will not be lost when you turn your GPS 75 off.
3.2 SATELLITE STATUS PAGES There are four status pages available by pressing PWR/STAT. Three pages display satellite tracking status, and the fourth is a menu of auxiliary functions (messages, setups, and utilities). The softkeys at the bottom of each page allow selecting pages: BAR (bar graph), STAT (status), SKY (skyview), and AUX (auxiliary menu). You may also cycle through these pages by repeatedly pressing PWR/STAT. Satellite Bar Graph The Satellite Bar Graph shows the signal quality of each visible satellite graphically. The receiver status is also shown at the top of the screen. In this example, the unit is simulating navigation. The satellite numbers (1-32) are represented along the bottom of the graph; signal quality (1, weakest to 9, strongest) is represented along the side. If a satellite is visible but not tracked, the signal quality will be blank. If differential corrections are available for a satellite, a D will appear at the bottom of the signed strength bar for that satellite. (See Section 6.7 for DGPS setup instructions.) Satellite Status Page The Satellite Status Page shows the ID, azimuth, elevation, and signal quality of each visible satellite in a table format. The receiver status, again, is displayed at the top of the screen, as well as the dilution of precision (DOP) and estimated position error (EPE). (For more information about unfamiliar terms, see Appendix B.)

* To view the Satellite Status Page, press softkey underneath the STAT banner.
* Press SKY Softkey To display Satellite Skyview.

Satellite

Skyview
* Press AUX Softkey to display the Auxiliary Menu Page.
The Satellite Skyview Page shows the azimuth and elevation of each visible satellite in a graphic skyview format. Additionally, the DOP and EPE are displayed. The azimuth and elevation are useful in determining whether a satellite signal is blocked by buildings, mountains, or other obstructions. If a satellite is not currently being tracked, it will be displayed in reverse video on the screen
Auxiliary Menu The Auxiliary Menu Page enables the selection of various setup and utility functions by moving the cursor to an item with the arrow keys and pressing ENT. Each setup and utility page is described in detail in Chapter 6. 3.3 PRESENT POSITION

Position

As mentioned earlier, the Position Page is automatically displayed once a position is obtained. This page displays track, ground speed, latitude and longitude relative to the selected map datum (see Section 6.8), as well as a choice of altitude above mean sea level (MSL) or time (cyclic field). (Note: Time information will not be displayed when the GPS 75 is acquiring satellites.)
When the GPS 75 is performing 2D navigation, the last known altitude will be used in the latitude/longitude computation. If the altitude is not accurate within a few hundred feet, you should manually enter your altitude. To enter the altitude (2D only). Use an arrow key to move the cursor under the altitude. Enter the altitude. If your antenna is mounted on a high mast, make sure you add the mast height. (Remember to complete the data entry by pressing ENT.) During initial satellite acquisition, the displayed position is the last computed position stored in the GPS 75. If your position has moved several hundred miles or more with the power off, the unit may go into the Autolocate mode. This process can take up to ten minutes. Alternatively, you may enter a more accurate initial position to speed up the acquisition process. (You may also change the position at any time while you are in simulator mode.) To enter the latitude/longitude. Use an arrow key to place the cursor on the latitude hemispheric designation (far left). Check the hemispheric designation (N or S) of the latitude. If it is correct, go to the next step. If it is incorrect, press CLR until the correct hemispheric designation is displayed. Place the cursor on the latitude field and enter the latitude. Depending on the position format selected (see Section 6.3), you will enter the latitude in one field (degrees only), two fields (degrees/minutes), or three fields (degrees/minutes/seconds or UTM). You must press ENT for each field to confirm the data entry. Check the hemispheric designation (E or W) of the longitude in the same manner as above for latitude. Enter the longitude (remember to complete the data entry by pressing ENT).

Longitude Latitude Route Storage Number
To capture present position.
Press AUTOSTO. The pre-assigned waypoint name is on line 1. NOTE: The AutoStoreTM location is captured as soon as you press AUTOSTO. This allows you all the time you need to change the waypoint name and/or confirm the Autostore. If you wish to give the waypoint a different name, move the cursor to the waypoint name field and enter the name of your choice. If you enter a waypoint name already used, you will be informed with the message, WPT Exists [name]. Enter a different name if this occurs. Press ENT. Press ENT on a blank route storage number field to save the waypoint. If the route storage number field is not blank, the waypoint will be added to the route shown. (In Chapter 4, we will discuss building a route with AutoStore.) 3.7GETTING THERE FAST--GOTO The GOTO function allows you to quickly set a course from your position to any waypoint.
To activate the GOTO function. Press GOTO. The above page will be displayed with the cursor on the GOTO waypoint field. If the GPS 75 is currently navigating to a waypoint, that waypoint will be offered as the default GOTO waypoint. If the waypoint field is blank or the waypoint shown is not the desired destination, type the new name right over the old name. NOTE: If a non-existent waypoint name is entered, the Waypoint Definition Page will appear to give you the opportunity to create the waypoint (see Section 3.4). Confirm the default GOTO waypoint by pressing the ENT key. The NAV Page will be displayed. (The D-Bar on the CDI will be recentered at this point, see Section 3.8 below.) Alternatively, the GOTO function may be quickly activated from many pages (e.g. the Nearest Waypoint Page or the Waypoint List) by placing the cursor over the desired waypoint name and pressing the GOTO key. The GOTO Page will be displayed with the cursor on the GOTO waypoint name. The GOTO function will be activated when the ENT key is pressed. To cancel the GOTO function. Press GOTO. Press CLR. The GOTO waypoint name will become blank.
Press ENT. The GPS 75 will start to navigate using the active route, if it has been programmed (see Chapter 4). Otherwise, the GPS 75 will stop computing waypoint navigation data. 3.8NAVIGATING TO A WAYPOINT There are four navigation pages available from the NAV key. You may cycle through the following with softkeys at the bottom of each page: NAV (navigation summary), CDI (graphic course deviation indicator), PLOT (graphic plotter), and POSN (Present Position Page). Active Leg Cyclic Fields D-Bar Relative Bearing Pointer 3-8 Cyclic Fields Scale Setting Course Deviation Indicator (CDI)

Navigation

Summary
The Navigation Summary Page displays direction, distance and speed information to direct you along a route or a GOTO destination. The active leg (route) waypoints or GOTO waypoint is shown at the top of the screen. The CDI is at the bottom of the page. Current CDI scale setting is shown at each end of the scale. This is replaced by the cross track distance if the D-Bar goes off the scale. A relative bearing pointer at the center of the CDI indicates the bearing to the waypoint relative to the current track (TRK). Notice that this page has four cyclic fields available. The field options are as follows: Field #1 (top left) provides a choice of: (a) bearing to destination waypoint (BRG), (b) course to steer (CTS), (c) desired track (DTK), (d) ground track (TRK), or (e) turn (TRN).

Select the simulator mode. Press PWR/STAT to select a Status Page. If the Auxiliary Page is not displayed, press the softkey underneath the AUX banner to select it.
Use the right arrow key to highlight Op Mode, press ENT.
If the operating mode field does not already display Simulator, move the cursor with the arrow keys to that field, and press CLR until it does, followed by ENT. The unit is now ready to start the simulation.
Check the present position.

POSN Softkey if needed

* Plus
Press NAV to display a navigation page. If the Present Position Page is not displayed, press the POSN softkey to select it. Note the present position. We will change the position to N39 W95. (If the unit is set to display UTM coordinates, refer to Section 6.3 to change the coordinates to latitude and longitude.)
Move the cursor to the latitude hemispheric designator with the arrow keys. Press CLR if you need to change this designator from S to N. Press ENT. With the cursor on the latitude degrees, press 3 and 9, then ENT. (You may need to enter 0 for minutes and/or seconds to clear these fields, if they are shown.) Move the cursor to the longitude hemispheric designator. Follow the same sequence as above to complete longitude entry. NOTE: The sample illustrations in this section assume that the factory default settings, including the selection of nautical units (knots, nautical miles), have not been changed. If these settings have been changed, the unit may display slightly different data than presented here. Changing the unit set-ups is covered later in Chapter 6. Check the GARMIN waypoint.
*Plus LIST softkey if needed
To verify that the GARMIN waypoint is in memory, press WPT to select a waypoint page. If the Waypoint List Page is not displayed, press the LIST softkey to select it. Verify that the waypoint, GARMIN, is on the list. If it is, you may skip the next three steps. NOTE: If the Waypoint List Page is full, use the arrow keys to scroll through the rest of the list until you locate the GARMIN waypoint. If the GARMIN waypoint is not listed, you must add it to the GPS 75's memory before you can activate the GOTO function. Press the WPT softkey. Move the cursor over the waypoint name field with the arrow keys. Enter G, A, R, M, I, N. Press ENT. Remember to use the arrow keys to select the letter you

want (e.g., to get the letter G, press the 3 key and then the left arrow). Enter the coordinates for the GARMIN waypoint using the same method described for setting the present position (see Section 3.3). Note, however, that depending on the unit setups, Lat/Lon coordinates will be entered in one (degrees only), two (degrees/ minutes) or three (degrees/minutes/seconds) fields. These setups are covered later in Chapter 6. Refer to the table below for the proper location numbers to enter: Setup Degrees Only Degrees/Min/Sec Latitude N38.94992 N59.7 Longitude W94.74638 W94 44.782 W46.9
Degrees/Minutes N38 56.995
With the coordinates entered, you are ready to proceed with the GOTO function.

GOTO MOB

GOTO GARMIN. Press GOTO/MOB. The GOTO Page is displayed with the cursor under the GOTO waypoint name. Enter the waypoint name, GARMIN with the alphanumeric keys and the arrow keys. Press ENT.

GARMIN

A navigation displayed.
alphanumeric and arrow keys.
If the Navigation Summary Page is not shown, select it with the NAV softkey.
*Plus NAV softkey if needed
A Faster GOTO. At this point, we will take a very brief detour. You may recall from Section 3.7 that there is an alternative to typing all those letters in. Let's try it. First we must cancel the existing GOTO by pressing GOTO/MOB, CLR, and ENT. This calls up the GOTO Page, clears the destination and then confirms that no GOTO destination is desired. Select the Waypoint List Page by pressing WPT and then the LIST softkey, if needed.
With the right arrow key, move the cursor to the GARMIN waypoint.
Press GOTO/MOB. The waypoint GARMIN is automatically carried over to the GOTO Page. (You can import waypoints to the GOTO Page from several other pages, including the Nearest Waypoint Page and the Plot Page, simply by highlighting the desired waypoint.)

Press ENT.

A navigation page is 3-15
then displayed. Select the NAV Summary Page with the NAV softkey. Now back to our trip.
Set the Simulation Speed. With the arrow keys move the cursor to the ground speed field. (If this field does not currently indicate GS, for ground speed, highlight that field with the left arrow key and press CLR until it does.)

4.4EDITING ROUTES To Edit an Existing Route. Select the Route Definition Page (RTE). Highlight the route number field and select the route you wish to edit. To insert a waypoint into the route, highlight the waypoint you want to place the new waypoint in front of. Type in the new waypoint name. Press ENT. The new waypoint is added to the route. To delete a waypoint from the route, highlight the waypoint you wish to delete. Press CLR and ENT. If you attempt to add a waypoint to a route that already contains 20 waypoints, you will be informed with the message, Route is Full. NOTE: You may also edit a route from the Active Route Page (see Section 4.6). 4.5DELETING ROUTES You may delete an unwanted route from the Route Definition Page. To delete a route. Highlight the route number field and select the route you wish to delete with CLR. Highlight the route action field and select >Clear? with the CLR key. Press ENT to delete the route.
4.6ACTIVE ROUTE Active Leg Range Waypoint List Cyclic Column: - ETE - ETA - DTK
The Active Route Page displays the waypoints of the active route starting with the active from and active to waypoints on the top line. Press the ACTV softkey to select this page. The Waypoint List displays route waypoints starting with the active to waypoint. For each waypoint, additional information is available. The first column displays Range (RNG). The second column is a cyclic field that displays Estimated Time Enroute (ETE, in hours/minutes or minutes/ seconds, as appropriate), Estimated Time of Arrival (ETA), or Desired Track (DTK). You may scroll through the waypoint list with the arrow keys. To edit the active route. To insert a waypoint, highlight the waypoint you want to place the new waypoint in front of. Type in the new waypoint name. Press ENT. The new waypoint is added to the route. To delete a waypoint, highlight the waypoint you wish to delete. Press CLR and ENT. 4.7ROUTE LIST The Route List Page displays a list of all routes currently stored in memory. Press the LIST softkey to select this page. The Route List Page displays the route numbers (far left), beginning waypoint, and final destination waypoint. You may also activate or delete a route from the Route List Page.

The Sunrise/Sunset Page allows you to calculate the sunrise and sunset times for a given waypoint location on a selected date (from 1990 through 2089).
To calculate the sunrise/sunset times for a waypoint. Highlight the waypoint name field and enter the desired waypoint name. Press ENT. The date field is highlighted. Enter the day, then month, then year to calculate the sunrise/sunset times. Press ENT on each alphanumeric field. Once the year is selected and ENT is pressed, the calculated sunrise and sunset times will be shown. Please note that the times shown will be either UTC or local depending on the selection made on the Date/Time Page. (See Section 6.5.) 6.11 TRIP AND FUEL PLANNING The Trip and Fuel Planning Page allows you to calculate time and fuel requirements between any two waypoints or for any programmed route. On the first cyclic field, you will choose between waypoint (WPT) or route (RTE) planning by highlighting and pressing CLR. If route planning is selected, you would then select the desired route number and the portion of the route (a given leg or all of the route) to calculate for. The final step is to enter speed and fuel flow rates. The GPS 75 will then calculate the desired track (DTK), fuel requirements (REQ), range (RNG), and estimated time enroute (ETE). To perform a Trip and Fuel Plan, waypoint to waypoint. Highlight the first cyclic field (top left), and press CLR to select WPTS:. Highlight the waypoint name field (second line), and enter the first waypoint name followed by ENT. The second waypoint name field is now highlighted. second waypoint name followed by ENT. 6-10 Enter the
The speed (SPD) field is highlighted. and press ENT.
Enter the intended speed, Enter the estimated fuel
The fuel flow (Flow) field is highlighted. flow followed by ENT.
The GPS 75 will now display the calculated figures. To perform a Trip and Fuel Plan for a route. Highlight the first cyclic field (top left), and select RTE with CLR. Highlight the next cyclic field and select the desired route number by pressing CLR.
Highlight the Leg> field and select the desired leg, or select All for the entire route, using CLR. Highlight the SPD: field and enter the intended speed, followed by ENT. Highlight the Flow: field and enter the estimated fuel flow followed by ENT. The GPS 75 will now display the calculated figures. 6.12 MESSAGES You may recall from Section 2.6 that some messages will remain on the Message Page after being viewed. When this occurs, the MSG annunciator remains on (but does not flash) in the lower left corner. To view these messages, select Messages from the Auxiliary Page. See Appendix A for a description of available messages.

APPENDIX A

MESSAGES
The GPS 75 uses the Message Page to communicate important information to you. Some messages are advisory in nature, others are warnings that may require your intervention. This appendix provides a complete list of messages and their meanings. Please pay careful attention to all messages. Alarm Clock - The alarm time for the alarm clock has been reached. Anchor Drag Alarm - Your craft has drifted outside the anchor drag radius set on the Alarm Page. Approaching ____ - You are less than one minute from reaching the indicated waypoint. Arrival At ____ - Your craft has entered the arrival alarm circle for the indicated destination waypoint. Battery Low - The battery pack is low on power. AA batteries should be replaced or the rechargeable battery pack should be recharged for continued operation. Can't Chng Activ WPT - An attempt has been made to modify the position of the active to or active from waypoint. The GPS 75 will not allow the modifications. Degraded Accuracy - The accuracy of the GPS 75 position is degraded beyond 500 meters due to satellite geometry or data quality. Additional cross checking should be performed by the user to verify the integrity of the GPS position. Memory Battery Low - The battery that sustains user memory is low and should be replaced by an authorized GARMIN service center as soon as possible. Failure to do so may result in loss of stored data, including all waypoints and routes. No DGPS Position corrected position. - Not enough DGPS data is available to compute a

No RTCM Input - A beacon receiver is improperly connected to the input port on the back of the GPS 75, a connected beacon receiver is not transmitting in an RTCM SC-104 version 2.0 format, or the baud rates do not match between the GPS 75 and the beacon receiver.
Osc Needs Adjustment - The GPS 75 has detected excessive drift in its internal crystal oscillator which may result in longer acquisition time. The unit should be taken to an authorized GARMIN service center as soon as possible. Poor GPS Coverage - The GPS 75 cannot acquire sufficient satellites necessary to provide navigation. Pwr Down and Re-init - The GPS 75 is unable to compute a position due to abnormal satellite conditions. Power down the unit and verify that the position on the Position Page is within a few degrees of your actual position. Proximity Alarm - Your craft has penetrated the alarm circle of a proximity waypoint. Proximity List Full - An attempt to upload more than nine proximity waypoints has been made. Proximity Overlap ____ - The circles defined by two proximity waypoints overlay. When entering the area of the overlap, the GPS 75 will alert you of the closest proximity waypoint, but not both. You should be certain this condition is desirable. Proximity Waypoint - An attempt has been made to delete a waypoint for which a proximity alarm has been defined. You must remove the waypoint from the proximity list before the waypoint can be deleted. Received Invalid Wpt - A waypoint was received in an upload/transfer operation that has an invalid identifier or position. Receiver Failed - The GPS 75 has detected a failure in the receiver hardware. If the message persists, the GPS 75 is unusable and should be taken to an authorized GARMIN service center. ROM Failed - The GPS 75 has detected a failure in its permanent memory. If this message occurs, the unit is unusable and should be taken to an authorized GARMIN service center. Route is Full - An attempt has been made to add more than 20 waypoints to a route. The GPS 75 will not allow more than 20 waypoints per route. Route Not Empty - An attempt has been made to copy a route to a nonempty route. The GPS 75 will not allow you to copy a route to a nonempty route.
Route Waypoint - An attempt has been made to delete a waypoint which is a member of one or more routes. You must remove the waypoint from all routes before the waypoint can be deleted. Route Wpt Deleted - A waypoint in a transmitted route does not exist in the database and has been deleted from the route. RTCM Input Failed - RTCM data was being received but the connection has been lost. Searching the Sky - The GPS 75 is in the search-the-sky mode. Allow the unit to complete its data collection before turning it off. This process takes approximately 15 minutes. Stored Data Lost - Stored user data, including waypoints, routes, and satellite orbital data has been lost due to a low memory battery. Timer Expired - The count down timer has expired. Track Memory Full - The track memory is full. Go to the Plotting Setup Page and clear the memory. WPT Exists ____ - You have entered a waypoint name on the AutoStoreTM Page that already exists in memory. Enter a waypoint name that does not exist. WPT Memory Full - The waypoint memory is full. You should delete unused waypoints to make room for new waypoints. WPT/RTE RX Started - The GPS 75 has received the first data transmission in a waypoint/route upload or transfer operation. WPT/RTE TX Complete - The GPS 75 has transmitted the last information in a waypoint/route transfer operation.

BATTERY PACK OPERATION

The GPS 75 is supplied with a sealed, 4-cell alkaline battery pack. The battery pack must be removed from the unit in order to replace the cells. To remove the battery pack.
Push down on the spring tab on the right side of the battery pack. Pull the battery pack off the right side of the unit.
To replace the alkaline batteries.
Grip the battery pack around the outside edge (not the bottom). Push the top of the battery pack against the edge of a hard surface which will not mar the plastic. The outer sleeve will slide off the cage, revealing the batteries inside. Replace the batteries, observing the polarity diagram engraved in the plastic. Slide the sleeve over the cage until it snaps into place, taking care that you do not tear the gaskets which seal the battery pack. C.6 MAINTENANCE
The GPS 75 is constructed of high quality material and should not require user maintenance. Please refer any repairs to an authorized GARMIN service center. (The unit contains no user serviceable parts, do not attempt repairs yourself.) Never allow gasoline or solvents to come into contact with your unit. Damage to the case may occur which is not covered by your warranty. The waypoints, routes, custom settings, and other data stored in the GPS 75 are maintained by an internal battery. (This data will not be lost even if you remove the AA or rechargeable battery pack for separate storage.)
The internal memory battery should typically last three to five years. If the GPS 75 detects a low memory battery, you will be informed with the message Memory Battery Low. You should return your unit to an authorized GARMIN service center as soon as possible for service. Failure to do so may result in loss of data each time you turn your unit off (indicated by the message Stored Data Lost). Your GPS 75 contains a highly accurate crystal oscillator which should provide many years of reliable operation. If the unit detects excessive oscillator drift, you will be informed with the message Osc Needs Adjustment. You should return your unit to an authorized GARMIN service center as soon as possible. Failure to do so may result in degraded acquisition performance. C.7 PRODUCT SUPPORT

Nahrwn Masirah Ilnd Nahrwn Saudi Arbia Nahrwn United Arab Naparima BWI Observatorio 1966 Old Egyptian Old Hawaiian Oman Ord Srvy Grt Britn Pico De Las Nieves Pitcairn Astro 1967 Prov So Amricn 56 Prov So Chilean 63 Puerto Rico Qatar National Qornoq Reunion Rome 1940 RT 90 Santo (Dos) Sao Braz Sapper Hill 1943 Schwarzeck South American 69
South Asia Southeast Base Southwest Base Timbalai 1948 Tokyo Tristan Astro 1968 Viti Levu 1916 Wake-Eniwetok 60 WGS 72 WGS 84 Zanderij
Nahrwn - Masirah Island (Oman) Nahrwn - Saudi Arabia Nahrwn - United Arab Emirates Naparima BWI - Trinidad and Tobago Observatorio 1966 - Corvo and Flores Islands (Azores) Old Egyptian - Egypt Old Hawaiian - Mean Value Oman - Oman Ord Srvy Grt Britn - England, Isle of Man, Scotland, Shetland Islands, Wales Pico De Las Nieves - Canary Islands Pitcairn Astro 1967 - Pitcairn Island Prov So Amricn 56 - Bolivia, Chile, Colombia, Ecuador, Guyana, Peru, Venezuela Prov So Chilean 63 - South Chile Puerto Rico - Puerto Rico, Virgin Islands Qatar National - Qatar Qornoq - South Greenland Reunion - Mascarene Island Rome 1940 - Sardinia Island SWEDEN Santo (Dos) - Espirito Santo Island Sao Braz - Sao Miguel, Santa Maria Islands (Azores) Sapper Hill 1943 - East Falkland Island Schwarzeck - Namibia South American 69 - Argentina, Bolivia, Brazil, Chile, Colombia, Ecuador, Guyana, Paraguay, Peru, Venezuela, Trinidad and Tobago South Asia - Singapore Southeast Base - Porto Santo and Madeira Islands Southwest Base - Faial, Graciosa, Pico, Sao Jorge, and Terceira Islands (Azores) Timbalai 1948 - Brunei and East Malaysia (Sarawak and Sabah) Tokyo - Japan, Korea, Okinawa Tristan Astro 1968 - Tristan da Cunha Viti Levu 1916 - Viti Levu Island (Fiji Islands) Wake-Eniwetok 60 - Marshall Islands WORLD GEODETIC SYSTEM 1972 WORLD GEODETIC SYSTEM 1984 Zanderij - Surinam

APPENDIX E

UTC TIME TO LOCAL TIME OFFSET
Reference the chart below to find the UTC-to-local time offset for your longitude zone. (If you are in a daylight savings time zone, add one hour to the offset.) For example, if you are at longitude W08100.00' and UTC time is 16:00, local time is 11:00 standard time. Longitude Zone W180.0 W172.5 W157.5 W142.5 W127.5 W112.5 W097.5 W082.5 W067.5 W052.5 W037.5 W022.5 W007.5 E007.5 E022.5 E037.5 E052.5 E067.5 E082.5 E097.5 E112.5 E127.5 E142.5 E157.5 E172.5 to to to to to to to to to to to to to to to to to to to to to to to to to W172.5 W157.5 W142.5 W127.5 W112.5 W097.5 W082.5 W067.5 W052.5 W037.5 W022.5 W007.5 E007.5 E022.5 E037.5 E052.5 E067.5 E082.5 E097.5 E112.5 E127.5 E142.5 E157.5 E172.5 E180.0 Offset - 12 - 11 - 10 - 9 - 8 - 7 - 6 - 5 - 4 - 3 - 2 - +1 +2 +3 +4 +5 +6 +7 +8 +9 +10 +11 +12