Troubleshooting – Garmin GPSMAP 640 User Manual
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GPSMAP 620 and GPSMAP 640 Owner’s Manual
Appendix
Garmin Ltd. and its subsidiaries (“Garmin”) grant you a
limited license to use the software embedded in this device (the
“Software”) in binary executable form in the normal operation of
the product. Title, ownership rights, and intellectual property rights
in and to the Software remain in Garmin and/or its third-party
providers.
You acknowledge that the Software is the property of Garmin and/
or its third-party providers and is protected under the United States
of America copyright laws and international copyright treaties.
You further acknowledge that the structure, organization, and
code of the Software, for which source code is not provided, are
valuable trade secrets of Garmin and/or its third-party providers
and that the Software in source code form remains a valuable
trade secret of Garmin and/or its third-party providers. You agree
not to decompile, disassemble, modify, reverse assemble, reverse
engineer, or reduce to human readable form the Software or any
part thereof or create any derivative works based on the Software.
You agree not to export or re-export the Software to any country in
violation of the export control laws of the United States of America
or the export control laws of any other applicable country.
Troubleshooting
Problem/Question
Solution/Answer
My device never gets
satellite signals.
Take your GPSMAP 620 or GPSMAP 640 out
of parking garages and away from tall buildings
and trees. Remain stationary for several
minutes.
My GPSMAP 620 or
GPSMAP 640 does
not charge in my
vehicle.
Check the fuse in the vehicle power cable
(
Ensure the vehicle is turned on and is supplying
power to the power outlet.
Your device can only charge between 32°F and
113°F (between 0°C and 45°C). If the device is
placed in direct sunlight or in a hot environment,
it cannot charge.
How do I clear all my
user data?
Hold your finger on the lower-right corner of the
GPSMAP 620 or GPSMAP 640 screen while it
is turning on. Keep your finger pressed until the
message appears. Touch Yes to clear all user
data.
My battery gauge
does not seem
accurate.
Allow the device to fully discharge, and fully
charge it (without interrupting the charge cycle).
The touchscreen is
not responding to my
touches.
Calibrate the touchscreen as described on
.