: I'm not at all a GPS guru, but I also have an eTrex (the blue one - I forget
: the model name) and it has a distance function built in. In fact, almost
: my only use of the gadget is to tell me how fast and how far.

: If I took the time to really learn all of the various gadgets I own I
: wouldn't have time to actually use them.

I have the etrex vista. the trip computer is pretty accurate. I have had it miss a point by over 100 feet, but taht was in pretty bad conditions. On the water it's been pretty good.

Internally it seems to keep track to 1/1000 of a minute, i.e. about 6 feet north-south, and less east-west (depending on lattitude) so if you were going in 12 foot circles, it may get pretty confused.