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68 GPSMAP 620 and GPSMAP 640 Owner’s Manual
Appendix
Appendix
Calibrating the Screen
Power the unit on in marine mode, or switch to marine mode.
See page 38 for calibration instructions.
Resetting Your GPSMAP 620 or
GPSMAP 640
If your GPSMAP 620 GPSMAP 640 stops responding, turn off the
device, and then turn it back on. If this does not help, reset your
device by removing and reconnecting the battery.
Updating the Software
1. Go to www.garmin.com/products/webupdater, and download
WebUpdater to your computer.
2. Connect the GPSMAP 620 or GPSMAP 640 to your computer
using the mini-USB cable.
3. Run WebUpdater, and follow the on-screen instructions.
After conrming that you want to perform an update, WebUpdater
automatically downloads the update and installs it on your device.
Clearing User Data
IMPORTANT: This deletes all user-entered information.
1. Hold your nger on the lower-right corner of the screen while
turning on the GPSMAP 620 or GPSMAP 640.
2. Keep your nger pressed on the screen until the pop-up window
appears.
3. Touch Yes to clear all user data.
All original settings are restored. Any items that you have saved are
erased.
Battery Information
To maximize the life of the battery, do not leave your
GPSMAP 620 or GPSMAP 640 in direct sunlight, and avoid
prolonged exposure to excessive heat.
The battery icon in the corner of the Menu page and the Home
screen indicates the status of the GPSMAP 620 or GPSMAP 640
battery. To increase the accuracy of the battery gauge, fully
discharge the battery and then fully charge it. Do not unplug the
GPSMAP 620 or GPSMAP 640 until it is totally charged.
NOTE: If the device will not used for an extended period of time
(longer than one week), remove the battery pack.