"Derrick Steed" wrote in message
...
Isn't there some form of flux gate compass which can be used? The GPS's we
use originated in the maritime market (after NMEA is a maritime standard),
surely there is a flux gate compass with NMEA output.

Rgds,

Derrick.

A flux gate compass is just another kind of magnetic compass. It eliminates
the jiggling of a pivoting compass card but it is still subject to
installation, variation and dip errors. The dip error means that it only
provides useful data when the wings are level. Still, they are probably
cheaper than GPS compasses.

GPS compasses are elegant in that they point to true north.

Bill Daniels