On Sun,1/22/2017 7:15 PM, Roger (K8RI) on TT wrote:
If I'm not mistaken the smart phones derive the compass from GPS
Not all -- many phones have sensors for position and orientation
separate from GPS. That's how, for example, they know when to rotate the
image when you rotate the device.
which is true, not magnetic so it wouldn't require a correction.
For GPS to determine azimuth the observer must be moving. That works
fine in a vehicle, but not when you're walking. Ask me how I know. :)
73, Jim K9YC
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