Wayne Paul wrote:
Marc,

I also believe the power line in the USB is 5V and your Garmin requires 12
V. So you need some kind of a voltage regulator to drop the voltage from 12
to 5 (12 will fry your PDA.)

Actually, the GPS 12 that the original poster mentioned is one of the
odd Garmins that needs a 5 to 8 VDC supply. I'm not sure how well it
will work, but if he is looking to supply power externally (which he may
not be), 5V may work for both...

Marc