Sébastien Lorquet wrote:
I'm not sure a magnetic sensor is useful when you have a GPS, because
a GPS can give you a heading as soon as the measured velocity is not zero!
It is true when you use it in a car when cruising with normal speeds.
When you are using your GPS on foot (installed with a hiking map) your
velocity's direction is not well defined enough and also when you stop
for navigating you usually turn a different direction than you were
walking. (I would use my device this way when hiking or geocaching -
see http://www.geocaching.com/)
Also sometimes I get fed up with the GPS and navigate using old
fashioned paper maps. A compass always comes handy ;-).
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