Replacing the Speed Sensor or Cadence SensorBatteryThe LED flashes red to indicate a low battery level after tworevolutions.1 Locate the circular battery cover À on the back of the sensor.2 Twist the cover counter-clockwise until the marker points tounlocked and the cover is loose enough to remove.3 Remove the cover and the battery Á.TIP: You can use a piece of tape  or a magnet to removethe battery from the cover.4 Wait 30 seconds.5 Insert the new battery into the cover, observing polarity.NOTE: Do not damage or lose the O-ring gasket.6 Twist the cover clockwise until the marker points to locked.NOTE: The LED flashes red and green for a few secondsafter battery replacement. When the LED flashes green andthen stops flashing, the device is active and ready to senddata.TroubleshootingUpdating the SoftwareBefore you can update your device software, you must have aGarmin Connect account, and you must download the GarminExpress™ application.1 Connect the device to your computer using the USB cable.When new software is available, the Garmin Expressapplication sends it to your device.2 Follow the on-screen instructions.3 Do not disconnect your device from the computer while theGarmin Express application downloads the software.TIP: If you are having trouble updating the software with theGarmin Express application, you may need to upload youractivity history to the Garmin Connect application and deleteyour activity history from the device. This should providesufficient memory space for the update.Support and UpdatesGarmin Express provides easy access to these services forGarmin devices.• Product registration• Product manuals• Software updates• Data uploads to Garmin ConnectGetting More Information• Go to www.garmin.com/intosports.• Go to www.garmin.com/learningcenter.• Go to http://buy.garmin.com, or contact your Garmin dealerfor information about optional accessories and replacementparts.Maximizing Battery Life• Turn off the Bluetooth wireless feature on your Edge 25device (Turning Off Bluetooth Technology, page 3).• Turn off GLONASS (System Settings, page 5).Acquiring Satellite SignalsThe device may need a clear view of the sky to acquire satellitesignals. The time and date are set automatically based on theGPS position.1 Go outdoors to an open area.The front of the device should be oriented toward the sky.2 Wait while the device locates satellites.It may take 30–60 seconds to locate satellite signals.Resetting the DeviceIf the device stops responding, you may need to reset it.NOTE: Resetting the device may erase your data or settings.1 Hold for 15 seconds.The device turns off.2 Hold for one second to turn on the device.Replacement O-ringsReplacement bands (O-rings) are available for the standardmount in two sizes:• 1.3 × 1.5 × 0.9 in. AS568-125• 1.7 × 1.9 × 0.9 in. AS568-131NOTE: Use Ethylene Propylene Diene Monomer (EPDM)replacement bands only. Go to http://buy.garmin.com, or contactyour Garmin dealer.Viewing Device InformationYou can view the unit ID, software version, GPS version, andsoftware information.Select > Settings > System > About.AppendixData fieldsSome data fields require ANT+ accessories to display data(Edge 25 device only).Avg. Speed: The average speed for the current activity.BPM: Your heart rate in beats per minute (bpm). Your devicemust be connected to a compatible heart rate monitor.Cadence: Cycling. The number of revolutions of the crank arm.Your device must be connected to a cadence accessory forthis data to appear.Calories: The amount of total calories burned.Distance: The distance traveled for the current track or activity.HR Zone: The current range of your heart rate (1 to 5). Thedefault zones are based on your user profile and maximumheart rate (220 minus your age).Speed: The current rate of travel.Time: The stopwatch time for the current activity.Troubleshooting 7