I thought I had this all worked out, but I can not get my alignments right. Magnetic declination in Melb is 11.3 deg EAST.
http://magnetic-declination.com/
MELBOURNE VICTORIA
Latitude: 37° 48' 50.4" S
Longitude: 144° 57' 48" E
Magnetic declination: 11° 34' EAST
Declination is POSITIVE
Inclination: -68° 44'
Magnetic field strength: 60024.9 nT
So I set up my mount facing south - 11.3 deg east of south.
NO wait, if true north is 11.3 deg EAST, then true south has to be 11.3 deg WEST. So point the mount 191.3 deg not 169.7 deg, yes?
http://www.ga.gov.au/oracle/geomag/agrfform.jsp
D, the magnetic declination (sometimes called the magnetic variation), is the angle between the horizontal component of the magnetic field and true north. It is positive when the compass points east of true north, and negative when the compass points west of true north. Declination is given in degrees and its annual change is in degrees per year.
The value of magnetic declination should be added to a magnetic compass bearing to yield the true north bearing.
Am I just confusing myself, the more I think about it the more confused I get. Grey matter working too slow.
Clear skies
Rod
