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Aligning an Astrotrac with a compass?
Hi All,
I've recently bought an Astrotrac, I've yet to try it out as the compass on my iPhone isn't very good (surprise surprise). Anyways, I need to buy a compass. I also know that I need to know the magnetic deviation for my area, as follows:
Latitude: 33° 49' 0" S
Longitude: 150° 58' 0" E
Magnetic declination: 12° 26' EAST
Declination is POSITIVE
Inclination: -64° 16'
Magnetic field strength: 57130.9 nT
My question is, what does all this MEAN? Do I need to calibrate my compass (that I haven't bought yet!) with the above?
And, what TYPE of compass is required? It would need to work at an angle. What's a good/cheap compass that will do the job, if such a thing exists? I'm in Australia, but happy to order online, provided freight is cheap.
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