Dave Houlton wrote:
Chris:

Take a look at http://www.gilsson.com/index.html. They've got a variety
of GPS antennas, amplified versions advertise tolerance of 2.5v - 12v.
Positive reviews in some Garmin forums, don't own one myself.

I just ordered one for my GPSMAP 76S. I'll let the group know how it
works out if there's interest.

Jeremy