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ARK
 Post subject: magnetic bearing
PostPosted: Tue Dec 12, 2006 5:48 pm 
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normal user

Joined: Sun Jan 15, 2006 1:10 pm
Posts: 6
Location: San Diego,CA
When a gps unit shows a magnetic bearing (to a destination) is this
computed internally or is satellite info used. Was wondering about the
constantly moving magnetic north pole.
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SatNav
 Post subject:
PostPosted: Tue Dec 12, 2006 6:02 pm 
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normal user

Joined: Sat Jul 22, 2006 7:03 pm
Posts: 192
Based on the grid bearing from the current (satellite) position to the destination point with the magnetic variation either derived (automatically) from a lookup table built into the firmware or from user configuration input.

Manufacturers from time to time will include updated variation models/tables with firmware releases.
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