Casey Wilson wrote:
From Radio Shack I picked up a gizmo to plug in a wall socket and
provide 12VDC power for the unit at the table. You will want to get
one of those.

If you're using a desktop PC to program the GPS, you've probably already
got a good +12 V source inside the PC. Each four-wire disk drive power
connector has two ground wires in the middle, +5 V on one end, and +12 V
on the other. Connect a fuse holder and a cigarette lighter receptacle
to +12 V and ground. Put a 2 to 5 A fuse in the fuse holder and you've
got a +12 V source to run your GPS, recharge your cell phone, etc. It's
probably not a good idea to plug in an actual cigarette lighter element
because that draws quite a bit of current (9-10 A or so).

Of course, the wall-plug supply is portable, if you want to play with
the GPS or recharge its internal battery at a remote location. Rat
Shock's 22-505 power supply is stunningly overpriced at $30; any store
that sells cell phone accessories should be able to sell you the same
thing for $10 or so.

Matt Roberds