Marc Ramsey wrote:
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...

And, just to confuse things further, the "GPS 12" is different from the
"GPS 12XL" and "GPS 12MAP", which both take 10 to 32 VDC externally...

Marc