Quote:
Originally Posted by sheeny
162 degrees is the magnetic direction of true south if your magnetic declination is -18 degrees. -18 degrees seems a bit big to me. I would've expected -12 degrees (or so) giving a magnetic bearing of true south of 168 degrees.
Magnetic and true south are different obviously, and a compass measures magnetic bearings so you need to know the magnetic declination for your location to convert one to the other.
|
For reference:
Australian Geomagnetic Reference Field Computation
Sutton Forest (trig station)
Requested: Latitude -34o 36' 00", Longitude 150o 18' 00", Elevation 0 km, Date 2010/03/1
Calculated: Latitude -34.6000o, Longitude +150.3000o, Elevation 0.00 km, Epoch 2010.1616
Magnetic Field Components
D = 12.475 deg
http://www.ga.gov.au/oracle/geomag/agrfform.jsp