Garmin nüvi 250W Owner's Manual page 44

Appendix
Problem/Question
My battery gauge
does not seem
accurate.
The touch screen is
not responding to my
touches.
How do I know my
nüvi is in USB mass
storage mode?
My computer never
senses that the nüvi
is connected.
I cannot see any new
removable drives in
my list of drives.

Solution/Answer
Allow the unit to fully discharge, and fully charge it
(without interrupting the charge cycle).
Calibrate the touch screen as described on
When your nüvi is in USB mass storage mode, a
picture of a nüvi connected to a computer is shown.
Also, you should see two new removable disk drives
My Computer.
listed in
1. Unplug the USB cable from your computer.
2. Turn off the nüvi.
3. Plug the USB cable into a USB port on
your computer and into your nüvi. The nüvi
automatically turns on and goes into USB mass
storage mode. Ensure your nüvi is connected to
a USB port and not a USB hub.
If you have several network drives mapped on your
computer, Windows can have trouble assigning
drive letters to your nüvi drives. See your operating
system Help file to learn how to map or assign drive
letters.
nüvi 200 and 200W series owner's manual
page 26.