Reading the compass and working out turns is core airmanship and a common spatial-orientation task in selection. Given a heading and a turn, work out the new heading, remembering that headings wrap around 360 degrees.
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This measures spatial orientation and mental compass work: adding and subtracting headings, finding reciprocals and turning the shortest way. It is the mental geometry of every heading change and bearing problem.
Round the turn to an easy amount, apply it, then fine-tune. Add for a right turn and subtract for a left, using 090, 180, 270 and 360 as reference marks.
Headings run 001 to 360 clockwise and wrap at north, so if a turn takes you past 360 subtract 360, and below 001 add 360. Most dropped marks here are wrap errors, not arithmetic.
Aptitude tests get you through selection. The EASA ATPL theory exams come next, and SkyStudy is built for that phase.
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