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76 GPSMAP 640 Owner’s Manual
Appendix
Problem/Question Solution/Answer
My computer
never detects the
GPSMAP 640 when I
connect it.
1. Unplug the USB cable from your computer.
2. Turn off the GPSMAP 640.
3. Plug the USB cable into a USB port on your
computer and into your GPSMAP 640. The
GPSMAP 640 automatically turns on and
goes into USB mass storage mode. Ensure
your GPSMAP 640 is connected to a USB
port and not a USB hub.
I cannot see any new
removable drives in
my list of drives.
If you have several network drives mapped
on your computer, Windows can have trouble
assigning drive letters to your GPSMAP 640
drives. See your operating system Help le to
learn how to map or assign drive letters.
How can I nd
restaurants near the
hotel I will be staying
at in the future?
1. Touch
Where To? > Near > A Different
City.
2. Find the hotel, and touch Go!.
3. Touch Menu > Where To? > Near > My
Destination.
4. Search for a restaurant. Restaurants
nearest your hotel are listed rst.
Messages and Alarms (Marine Mode)
AIS: Dangerous Target—an AIS target currently presents a
collision threat.
Alarm Clock
—the alarm clock alarm has sounded.
Anchor Drag Alarm
—the boat has drifted out of the user-set
distance range.
Antenna Input is Shorted —there is a short in the wiring to the
internal or external antenna.
Approaching Waypoint <name>
—the boat is a specied alarm
distance from the destination waypoint.
Arrival Alarm <name>
—arriving at destination waypoint.
Auto-guidance unable to calculate route
—(BlueChart g2 Vision)
auto-guidance cannot calculate the route. Ensure that both your
current position and the end point are contained in the BlueChart
g2 Vision region contained on the inserted SD card.
Auto-guidance unable to calculate route. Ending position not
within safe depth—(BlueChart g2 Vision) auto-guidance cannot
calculate the route; choose an end point within the specied safe
depth.
84


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