>  turn on the GPS, switch to the screen with the odometer display
> and zero it out.  Let it run until you get back home.  Now record what the
> total distance is.  Which units show near zero distance, which show actual
> distance traveled?  Record results, report back to the list with make/model
> data.

I just ran a "there and back" showing 32.4 miles there, 32.4 miles
back, 64.8 total. Decided to test my mechanical trip meter at the same
time, and it's within a hundredth or so of 64.8 also. I'm running the
GoWesty 16" wheels with the larger-than-stock tires, though, which
"correct" my speedometer's error. Perhaps the odometers record high
just like the speedo does?

GPS is a Garmin GPS III

--
John Bange
'90 Vanagon - "Geldsauger"