Quote:
Originally Posted by LewisM
Yes very true but remember we don’t point to MAGNETIC south in astronomy but to true south, so in this case, whatever the compass shows SUBTRACT mag var’n to get TRUE south
It’s the opposite of navigation where maps are in true and you use mag var’n to convert to magnetic to use in aircraft (in my case), ships etc
|
I'm sorry Lewis but, that is still not correct... I know we use True South but, a magnetic compass will indicate Magnetic South by virtue of the opposite pointer of the red one that's pointing to magnetic North. You still have to add the easterly variation to convert it to a true bearing, doesn't matter whether you are navigating, trying to find true south or whatever application... easterly variation still has to be added to the magnetic bearing to obtain a true bearing... in this case True South or 180* True...
Other than Martin's Solar method, the other way round this is to use a phone compass with GPS & set it to read true rather than compass... that works too...