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Aliens, definitely aliens. Obvious place for them to make initial probe. :D

Definitely re calibrate if you take batteries out between trips, or for replacement

I used to do this with my gps, but since changing to track up at someone's suggestion, I find it much better. Gibo. Have you calibrated the compass on gps, and is it a model with triple axis...

I print of a map of the area I am going to , using Freshman and blowing up to double the usual 1:50.000. This means it is much much easier to read, and is still on a scale that is usable in...