Indeed. When you taxi an airplane on the ground in a straight live or drive a 
car in a straight line, GPS TRACK (adjusted for magnetic declination) = 
Magnetic Heading.

The other complementary magnetometer calibration techniques involve driving 
around in a full circle in about 60 to 75 seconds or doing a 360 degree turn 
and stopping every 30 degrees.


Sent from my iPhone

> On May 11, 2014, at 4:47 AM, "Jake" <> wrote:
>> On 05/11/2014 07:08 AM, joerg Reisenweber wrote:
>>> On Sat 10 May 2014 11:57:30 Pascal Gosselin wrote:
>>> calibrate the compass via GPS track by an easy calibration or
>>> self-calibration method
>> GPS doesn't offer any data to calibrate magnetometer from. 
>> magnetometer aka compass is about orientation of device, GPS is
>> about position and movement vector. They are 100% unrelated.
> In a static situation this is correct, but while moving it is possible
> to get the current heading from GPS.
> Jake
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