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Geonaute Cardio CWT500 Manual

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Congratulations on your purchase of this CW T500 heart rate monitor! If you play a sport regularly or want to make progress in your training, the CW T500 heart rate monitor is for you. EN The CW T500, with its automatic target zone and out of zone alarm, simultaneous heart rate and stopwatch/countdown display, exercise intensity display in % and training session recording function, will help you to accurately manage your training sessions and achieve your objectives. This product uses an exclusive dynamic heart rate measurement technique. It adapts to the intensity of your exercise to provide the best possible combination of measurement stability and responsiveness. The products design and comfort have also been specially tailored to suit all body types and to make it easy to use during sporting activity. Please read the owner's manual carefully before use. Keep this manual for the entire life of the product.


GEONAUTE guarantees the initial purchaser of this heart rate monitor that it will be free from defects of materials or manufacture for a period of two years from the date of purchase. Please keep your receipt as proof of purchase. This guarantee does not cover damage resulting from misuse, from a failure to respect the precautions for use, from accidents, from improper maintenance or from commercial use. This warranty does not cover damage resulting from repairs carried out by persons not authorised by Geonaute. The guarantees contained herein explicitly replace all other guarantees including the implicit guarantee of merchantability and/or suitability for use. Geonaute cannot under any circumstances be held liable for any damage, whether direct or indirect, general or specific, caused by or related to these instructions for use or the products they describe. During the warranty period, the item will either be repaired free of charge by an authorised repair service or replaced free of charge (depending on the retailer). The warranty does not cover batteries or cracked or broken casings where signs of a blow are evident. The warranty does not cover the elastic strap, which is subject to wear and tear.


This CW T500 heart rate monitor is made up of a watch and a chest strap. The watch is designed to be worn on the wrist or placed on its bicycle mount during various sporting activities, in a temperate climate. It allows the user to display various items of information and to access its functions, such as the stopwatch, using the buttons. The chest strap must be positioned on the thorax. When correctly placed it transmits heart rate data to the watch. When placed in its cradle (see diagram), the watch displays your heart rate and various additional items of information (target zone, exercise intensity, etc) to manage and maximise your fitness regime or your training. The chest strap does not have a coded transmitter. Interchanges of information may occur if you are close (around 1m) to other heart rate monitor users.

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100 cm 50 cm 50 cm


Recommendations for use :
Handle the product with care - do not drop it or subject it to strong impacts. Do not dismantle the watch. This would void the warranty and could cause damage and loss of waterproofing. Do not subject the watch to extreme temperatures. If the watch is exposed to the sun for too long, the display may darken temporarily, before returning to normal when it has cooled down. Only clean the watch using a soft damp cloth. Do not use detergents, as these may damage the watch equipment. Only the elastic part of the strap may be machine washed (30).

Waterproof design :

This watch is waterproof to 5 ATM. It can therefore be used in wet conditions, in heavy rain, in the shower or when swimming. However, you must not dive when wearing it, or swim to depths greater than 5m. Do not press the buttons under water. The chest strap is only water resistant. This means it is impermeable to sweat and can be worn in the rain and under wet clothing, but should not be worn in the shower or when swimming.

Warning !

This product is designed for sports and leisure activities. It is not a medical device. The information given by the device or in this booklet is merely for information purposes and must only be used to monitor medical progress after consultation with and the agreement of your doctor. Likewise, healthy athletes should bear in mind that determining maximum heart rates and personal training goals are vital elements of an effective and risk-free training programme. It is recommended that you seek the advice of your doctor or health professional to set a maximum heart rhythm, your upper and lower rates, and an exercise frequency and duration suited to your age, physical condition and desired results. Finally, because of possible disturbances caused by the radio transmission system, we advise that users of pacemakers do not use a heart rate monitor which uses this technology, such as the CW T500. Failure to comply with these recommendations may cause a fatal risk.


Before using your CW T500 heart rate monitor, read the instructions carefully and follow the setting procedures closely.


The chest strap uses a CR 2032 3V battery. The watch uses a CR 2032 3V battery.

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Watch : We recommend that you do not change the watch battery yourself. Instead you should ask a DECATHLON specialist to change it for you. If you change the battery yourself, you risk damaging the seal, thus impairing the waterproof design and voiding your warranty. Please check the availability of the battery with your retailer before you travel. Chest strap : If the heart rate data becomes incoherent or the heart symbol does not flash on the screen when the watch is placed in its cradle, it may be necessary to change the chest strap battery. You can change the battery yourself, without the aid of specialist tools. How to change the battery : Unscrew the battery compartment lid using a coin and then remove it. Remove the old battery by tapping the other side of the strap. Replace the used battery with a CR2032 3V lithium battery without touching the 2 poles (it may lose its charge). The battery should be positioned with the + pole (printed side) facing upwards. Replace the lid carefully (be careful with the waterproof join) and turn it a quarter of a turn to the "close" position. Should you have a problem, contact your retailer.


The crossed-out bin symbol indicates that this product and the batteries it contains cannot be disposed of with household waste. They are subject to a specific type of sorting. Deposit the batteries and your unusable electronic product in an authorised collection area for recycling. This treatment of your electronic waste will protect the environment and your health.


The chest strap functions as a receiver and a transmitter. At the surface of your skin it measures the differences in potential created by your heart beat. It then sends this information to the watch by radio signal. Measurement quality and accuracy depend on it being correctly positioned, as does comfort during exercise. As the diagram below shows, the receivers are the black rubber surfaces on both sides of the central section.

Measurement pads

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Placing procedure : 1. Moisten the pads with water or a conductive liquid gel to ensure good contact. 2. Insert one of the ends of the elastic into one of the specially designed holes in the strap. 3. Join the strap around your chest and position it just below your pectoral muscles. Place one of the pads below your heart and the other Receiver under your right pectoral muscle. 4. Adjust the length of the strap for a firm but comfortable hold. The Receiver strap should not move if you jump or move your arms. 5. Check it is positioned correctly by holding the watch 50cm away. The heart symbol should flash on the display. If it does not flash correctly: Reduce the distance between the strap and the watch. Adjust the strap position while moistening the pads well. Check the batteries, especially in the strap.

Important :

Avoid positioning the pads on very hairy areas. In cold and dry climates, the strap may need several minutes to work correctly. The pads need a layer of sweat to ensure contact with the skin. When it begins taking measurements, the watch may show very high values for around 20 seconds. This is the algorithm beginning. After this time the display will stabilise and show correct values. Be careful to insert the elastic strap clip into the hole in the strap designed for this purpose. Maintain the lock pin by passing your finger behind the strap.


The heart rate monitor has six different modes : TIME mode : displays the time and date. HRM mode : displays heart rate on the top line. Displays the exercise stopwatch, exercise intensity in %, time in the target zone, calories expended, and average and maximum rate on the middle line. Displays the heart symbol and out of target zone arrows. Displays recovery time necessary after exercise. DATA mode : displays data saved during each session: exercise time, exercise intensity, time in the target zone, calories expended, average and maximum rate, time out of the target zone and the time needed to reach recovery rate. STOPWATCH mode : displays exercise time and lap time. TIMER mode : displays the countdown and heart rate.

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ALARM mode : displays the time set for the alarm and whether or not the alarms are activated (ON or OFF). To change modes, press S2. The mode name (TIME, HRM, etc) is displayed on the screen for two seconds before the home screen of the function appears.


Practical information : When setting, the S1 button increases the value. To make settings more quickly, hold down S1 to increase scrolling speed. If no button is pressed for several seconds when setting, the watch automatically exits setting mode.

1 - Time mode

S1 S2 S3 S4

: : : :

hourly beep mode setting/return to zero electroluminescence
Setting the time, date and 12/24 hour mode In time mode, hold down S3 for 3 seconds. The hours flash. Set the time chosen using S1. Confirm your setting by pressing S2. The minutes flash. Set the minutes using S1. Keep pressing S2 to set the seconds, year, month, date and the 12/24 hour display mode. The day of the week is set automatically. Press S3 to exit setting. Sounds setting In time mode, press S1 to activate/deactivate the hourly beep (beep at the top of the hour).

2 - Heart mode (HRM)

S T/ S
S1 S2 S3 S4 : : : : hourly beep mode setting/return to zero electroluminescence


00.00.00 HRM
Displaying the heart rate monitor (HRM) In HRM mode, the top line displays heart rate in beats per minute (bpm). The heart symbol is displayed at the bottom of the screen. The heart flashes when the watch receives a signal sent by the chest strap.


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The middle line displays four different items of information : total time elapsed since the beginning of the exercise session. time in the target zone since the beginning of the exercise session. average heart rate maximum heart rate Press S3 to go from one display to the next. The CW T500 heart rate monitor offers two different modes for the target zone : - manual target zone enabling direct entry of upper and lower limits in bpm - automatic target zone enabling calculation of upper and lower limits according to the exercise intensity chosen. Setting the HRM mode Go to HRM mode by pressing S2. To go to setting mode hold down S3 for three seconds. NB : After each operation, move on to the next setting by pressing S2. Set your gender with S1 : Choose MALE or FEMALE. Move on to the next setting by pressing S2. Set your age with S1. Go to the next setting. Now select your weight measurement unit (kg or lb). Go to the next setting. Now set your weight by pressing S1. Go to the next setting. Now select your height measurement unit (cm or - for feet). Go to the next setting. Now set your height by pressing S1. Go to the next setting. Now set your level of activity by pressing S1 : 0 = occasional activity, 1 = regular activity, 2 = intensive activity. This information is used as a corrective coefficient in calculating calories expended. Go to the next setting. Now select target zone mode : auto to automatically calculate target zone limits according to desired exercise intensity, or manu to manually enter upper and lower target zone limits. Go to the next setting. If you have selected manual mode (manu), you now set the lower limit. SET LO is displayed. Set the value you have chosen using S1. Now access upper limit settings by pressing S2. SET HI is displayed. Set the value you have chosen with S1. If you have selected automatic mode (auto), you can now set your resting heart rate. This should be measured when you get up in the morning, before any physical exercise. Set the value with S1. The default value is 50 beats per minute but you can set a value as low as 30 beats per minute. Go to the next setting. Now set your maximum heart rate. The default value displayed is the result of a theoretical calculation based on your age and gender. If you wish, you can modify this value with S1. To accurately calculate your maximum heart rate, we recommend that you undertake an exercise test with your doctor. Go to the next setting. Next set the lower target zone limit, shown in %. Min In is displayed. Set the desired value with S1 and then go to upper limit setting (Max In) with S2. Set the desired value with S1. Having set the limits for the target zone, press S2 to activate the out of zone alarm. Select ON or OFF with S1. Confirm and exit setting mode by pressing S3. Using the HRM mode. When the watch is searching for the signal transmitted by the strap, --- is displayed on the top line. When the heart signal is detected, the heart reception symbol flashes and the heart rate is displayed after several seconds. Ignore the first value shown. The watch needs around twenty seconds to make calculations and read data in order to display a stable, reliable figure. If you have already set a target exercise zone, the watch displays alongside

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the heart symbol : either an up arrow to indicate that you are currently above the target zone or a down arrow to indicate that you have not yet reached the target zone. If you have activated the out of zone alarm, a beep warns you when you are not in the target zone. Press S3 to select the desired display mode on the middle line. To be able to start the stopwatch, you must first display it. Press S1 to start the exercise stopwatch. The stopwatch symbol flashes at the bottom of the screen. The time in the zone and average and maximum heart rate calculations are activated. During or after exercise, you can display the time elapsed, the time in the zone, and average and maximum heart rates by pressing S3. To stop the exercise stopwatch, press S1 again.
To reset the stopwatch to zero and save the data to memory, hold down S3 for three seconds. SAVE is displayed on the top line. Press S1 and select "YES" to save the data to memory or "NO" to delete it immediately. Confirm by pressing S3. If you select YES, the data is saved. The HRM mode is reset to zero.

3 - Memory mode (DATA)

Select DATA mode by pressing S2.
DATA mode display The bottom line displays the file number (marked DATA). If the file is empty, no data is displayed. The middle line indicates the various settings displayed (exercise time, exercise intensity, time in the target zone, calories expended, average and maximum heart rates, time out of the target zone and time needed to reach recovery rate. The top line indicates the value of each of these settings. Using DATA mode Select DATA mode with S2. The device automatically displays the file content. To delete the content of the file, hold down S3 for three seconds. ERASE is displayed on the middle line. Confirm by pressing S3.

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4 - Stopwatch mode (CHRONO)
Select the stopwatch by pressing the S2 mode button.
start stopwatch mode Lap times/reset to zero electroluminescence
Stopwatch display. The top line displays the total exercise time. The middle line shows the lap time. Using the stopwatch Press S1 to start the stopwatch. The two lines simultaneously display the exercise time. The stopwatch symbol flashes at the bottom of the screen. To record a lap time, press S3. The total time since the beginning of the exercise is displayed on the top line for five seconds. The lap time is displayed on the middle line. After this time, the stopwatch returns to normal display mode. The total time since the beginning of the exercise scrolls on the top line and the time since the previous LAP scrolls on the middle line. Press S1 to stop the stopwatch. The stopwatch symbol disappears. To reset the stopwatch to zero, hold down S3 for three seconds. The two lines flash and the display then returns to zero.

5 - Countdown mode (TIMER)
Select the countdown timer by pressing S2.
Countdown display The top line displays the countdown beginning at the preset value. The middle line shows your heart rate. The bottom line displays TIMER. Setting the countdown timer Hold down S3 for four seconds to set the countdown value. The seconds flash. Set the seconds value with S1. Set the minutes and hours by pressing S2. Having set the countdown value, select repeat on for a repetitive countdown or repeat off for a one-off countdown. Confirm and exit setting mode by pressing S3. Using the countdown Press S1 to start the countdown. The time will count down from the preset value. When the countdown reaches zero, an alarm sounds. The device then stops at 0 if you have selected REPEAT OFF" or repeats the countdown if

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you have selected "REPEAT ON. Press S1 to stop the countdown and hold down S3 for two seconds to reset the countdown to zero.

6 - Alarm mode (ALARM)

S1 S2 S3 S4 : : : : activate the alarm alarm mode confirm and exit setting mode electroluminescence
Setting the alarm mode Go to ALM mode by pressing S2. Hold down S3 to set the hour. Set the chosen value using S1. Confirm your setting with S2. Set the minutes with S1. Confirm and exit setting mode by pressing S3. The alarm is automatically activated. ON and the symbol.)) are displayed. Activate/deactivate the alarm Press S1 to activate the alarm. ON and the alarm symbol are displayed on the screen. The alarm symbol will also be displayed in time mode. Press S1 to deactivate the alarm. OFF is displayed and the alarm symbol disappears. Using the alarm The alarm sounds at the preset time. To turn the alarm off when it sounds, press any button.


Watch waterproof to : 5ATM Strap waterproof to : 1ATM (not suitable for swimming) Temperature : From 10C (14F) to 50C(122F) Radio transmission : Amplitude modulation on a carrier wave (5kHz) Stopwatch from 0 to 99hr 59min 59.99sec: resolution 1/100 s Exercise stopwatch from 0 to 99hr 59mins 59.99sec: resolution 1/100 s
Batteries : - Watch : CR 2032 (do not change yourself) - Strap : CR 2032 - Approximate battery life in normal use (5hrs per week in HRM mode): 1.5 years for the watch and around 1 year for the strap. Important : The backlighting function uses a lot of power (2000 times more than the watch when functioning normally). If you use this function frequently, the batteries life may be significantly reduced. After several hours of use you will need to change them.

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1.1 Insufficient moistening of electrodes.
1 No heart rate displayed.
1.2 Strap not positioned correctly.
1.3 Strap battery low or not functioning.
2 Faint or unreadable watch display.
2.1 HRM watch battery is low.
3.1 The device is suffering from interference.
3 The rate displayed is erratic or much too high.
3.2 You are detecting the heart rate of another runner.

3.3 Strap is rubbing

3.4 - Poor conduction in dry and cold weather.
4 The rate displayed at the beginning of exercise is incoherent.
4.1 The algorithm is beginning.
5 The product does not function correctly.
5.1 The buttons do not activate the correct functions, or the device seems to be functioning abnormally.
6 When using the HRM function, the device beeps.
6.1 The target zone alarm is set wrongly.
If you cannot find the solution to your problem in this problem-solving table, please contact your DECATHLON after-sales service.

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Moisten the electrodes with water or a liquid conductive gel.
Check that the strap is positioned correctly around your rib cage, as in the diagram featured in these instructions. After checking the two points above, bring the HRM watch close to the strap you are wearing to check that transmission is re-established. If necessary, change the strap battery as indicated in the instructions.
To change the HRM watch battery, consult a DECATHLON specialist. You may be in an area with a strong magnetic field, a power line, a catenary system, radio communication equipment, etc. In this event, move away from the area. The strap does not have a coded transmitter. The strap does not have a coded transmitter. Check that the strap is fastened correctly and that the electrodes are well moistened. If the strap rubs it will send a signal which does not match your heart rhythm. When the weather is dry and cold the product may send out erroneous information for a few minutes. This is normal because a layer of sweat is needed to provide good contact between the skin and the electrodes. For several dozen seconds the value displayed may not match your actual heart rhythm. This is due to the beginning of the algorithm.
Activate the RESET function by holding down S1, S2, S3 and S4 simultaneously for two seconds. Then follow the setting procedure described in the instructions.

The target zone alarm is probably activated, and you are out of the zone. Refer to the instructions for how to set the zone or deactivate the target zone alarm.

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For best results and to protect your safety, it is essential that you are aware of various physiological factors linked to training. The advice we provide below is aimed at healthy, sporty people without any medical difficulties. We strongly advise you to seek the advice of your doctor to design more accurate training zones.
Important : Know your limits and do not exceed them !
To maximise the benefits of your physical training, you should first find your maximum heart rate (MHR) in beats per minute (bpm). Your MHR can be estimated in the following way: MHR = 220 - your age During a fitness programme, several training zones will give specific results corresponding to different objectives. Depending on exercise intensity, the proportion of energy coming from the combustion of sugars and fats changes.
Fats Sugars % MHR 50% - 60% 60% - 70% 70% - 80% 80% - 90% Moderate activity (walking, hiking, etc) Weight control (cardio training, running, inline skating) Aerobic zone (endurance training, 10km) Speed training (400m)
E.g. : A 30-year-old athlete doing aerobic endurance training to increase her resistance to exercise and improve her 10,000m time. The most effective training zone for her objective would be between 80 and 90% of her maximum heart rate.


This product conforms to section 15 of the FCC rules. It functions according to the following two conditions: 1. This device will not produce harmful interference. 2. This device must accept any interference received, including interference that may cause undesired operations. This equipment generates, uses and emits radio frequency energy and, if it is not installed in accordance with the instructions, may cause interference which is harmful to radio communication. However, there is no guarantee that it will not produce interference in a particular environment. If this equipment causes interference which is harmful to radio or television reception, bearing in mind that interference can be controlled by turning the device off and then on again, the user is advised to guard against this

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interference by taking one or more of the following measures: - Reorienting or moving the reception aerial. - Increasing the distance between the device and the receiver. - Plugging the device into a socket on a different circuit to that on which the receiver is plugged in. - Seeking the advice of the retailer or a technician specialising in radio/television.
Important : Any change or modification not explicitly approved by Dcathlon may void the authorisation given to the user to use the equipment.


This device has a factory diagnostic mode: - To launch factory mode, hold down all the buttons at the same time for two seconds. - To begin factory mode, hold down the MODE button for two seconds when the system reboots. The system automatically launches the following sequence : The model number is displayed on the first line and the version on the second line. Press MODE to check that digits 0-9 are displayed on the two lines. The screen then displays the model and version numbers again. Press SET at any time to leave factory mode and return to the time display.


So that we continue to develop improved products which meet your needs, we are pleased to hear your feedback with regard to the quality, functionality and usage of our products. - In France, you can contact the customer relations centre on : (price of a local call). - In other countries, you can leave a message on the appropriate section of our website at We will reply as soon as possible.



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