Quote:
Originally Posted by ridetheworld
...why didn`t the blue waypointer rotate as I moved the unit around on the spot (for the eTrex 20)?
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The eTrex 20 doesn't have a true compass inside it. Hence, it can only determine direction by observing lateral movement... movement between two different places (that creates a vector), rather than simple rotational movement (if you just rotate the thing in the same location, it's not moving in relation to the GPS satellite constellation).
The eTrex 30 does have a stand-alone compass mechanism (a flux valve) in it. Hence it does not rely on the satellite constellation to calculate a vector when you move the device laterally (i.e. 5 feet in any direction away from your starting position). The compass would work even if the entire satellite constellation was turned off.
But... having said all that, I still don't think that the eTrex series would be the best choice for off-road motorcycle riding (primarily due to the small screen), unless you were doing most of your riding pretty close to home, and had no need at all for any navigational guidance on the road.
Michael
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