Re: Magnetic Variance
here's another method:
1. Set your chartplotter to show Magnetic headings instead of True. Just follow those same headings on your boat's compass.
2. Print out this thread in case your plotter gives up and you have to go back to paper charts.
Seriously, I learned the TVMDC jingles and passed the nav exam, etc. etc. but I rarely use any of that now that there is a decent plotter on the boat. It speaks magnetic. All the compasses speak magnetic. No need ever to convert T to M or M to T. (Deviation is minimal on my fiberglass boat unless I park the binocs on the pedestal. Makes the compass lie)