Well, its getting back into full on dirtbiking season (not so hot), and i'm thinking of getting a GPS receiver. Theres quite a few about, but the most popular seems to be the Garmin eTrex Personal Navigator.

There is a lot of information at garmin, and I found a some reviews gadgetmad.com , askmen.com,
and Amazon has this excellent

My first (two day) ride with AMTRA was to Millicent, South Australia.

The ride was rated moderate/hard due to the large amount of beach/sand riding, moving off into forest riding on the second day.

Well it happened that the SA Police picked the Friday night to put a Breathalyser on the freeway coming out of Adelaide! Which delayed my Pickup by Mark & Ian by at least 30 minutes.

Anyway, they arrived, We put the XR onto the trailer with the other two bikes, showed the gear into the back of the station wagon, and off we rolled.