You are steering a magnetic compass course of 075°. The variation for the area is 10°W, and the compass deviation is 5°E. What is the true course you are steering?
• Relationship between compass course, magnetic course, and true course • Effect of variation (west or east) on converting between magnetic and true • Effect of deviation (west or east) on converting between compass and magnetic
• First, think about how to get from compass to magnetic: does east deviation get added or subtracted when going from compass to magnetic? • Next, think about how to get from magnetic to true: does west variation get added or subtracted when going from magnetic to true? • After each step, ask: should the value be getting numerically larger or smaller based on the rule you use?
• Write the standard memory aid you use (for example, "Can Dead Men Vote Twice" or similar) and line up C, D, M, V, T in order • Make sure you apply deviation first, then variation, starting from the given compass course • After calculating, check if your final true course is within a reasonable range of the original compass course (not a huge, illogical change)
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