Compass Conversion Drill
True · Variation · Magnetic · Deviation · Compass — master the TVMDC chain.
Before You Start — The TVMDC Chain
TrueVariationMagneticDeviationCompass
True → Compass
East errors: subtract
West errors: add
"True Virgins Make Dull Companions"
Compass → True
East errors: add
West errors: subtract
"Can Dead Men Vote True?"