ok just installed this app as i realised it wasnt a default app.
looks as if it uses gps to pinpoint the poles then uses the accelerometer to pin point direction.
I would imagine this fails because the samsung have not put much effort into the accelerometer due to it only being used for screentilts as its not very sensitive.
also ive found its very depended on how you hold the device
its more accurate when laid completely flat on a table as apposed to standing up with device at a normal 70% angle
if you tilt it from normal holding to completely flat youll see what i mean
that last point isnt a device issue. that would affect any device with accelerometer that uses this app making the compass pretty inaccurate regardless.
1st point is samsung probably didnt think about accelerometer accuracy for compass use probably to similar points i made above
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