In order to get the maximum amount of data from each journey, I am currently using three GPS's simultaneously.

I'm using:
1. My orginal Garmin Etrex Legend
2. Maemo-Mapper running on a Nokia N770 with a Cellink BTG-7000 bluetooth GPS
3. Sports-Tracker running on a Nokia N95

Depending on the journey I may use one or all of them.

Comparison of the results shows the Cellink and N95 producing near identical traces, whereas the much older Etrex tends to deviate by a good margin especially under trees.