Correct, Variation in the BOB map is 10 West. So any headings you measure on the map or with Map tools are TRUE. To fly Magnetic ADD 10 DEGREES to the value you measure. then fly this heading in game.
You measure a on the map a course of 240 TRUE apply the variation +10 to arrive at your required Magnetic heading of 250MAG. You fly 250 MAG on the compass.
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