[gpsd-dev] ✘Magnetic Variation (deviation)

[Gary E. Miller]

Yo All!

FYI:

Some nice folks at NOAA hit me with a clue-bat about magnetic variation
(declination).  With that help I was able to add the mag_var()
function to gpsd.  It calculates an approximate magnetic variation
from a lot/lon from a 5x5 degree table of variations.  In most cases
the variation is 2 degrees or better to actual.  This data is now
in the TPV JSON as magvar.

This makes life much easier for users that have magnetic heading
sensors.

RGDS
GARY
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Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
        address@hidden  Tel:+1 541 382 8588

            Veritas liberabit vos. -- Quid est veritas?
    "If you can’t measure it, you can’t improve it." - Lord Kelvin

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