A compass has a residual deviation of +1 degree (1 degree east). To fly a magnetic heading of 180 degrees the pilot must steer
- 181 degrees.
- 180 degrees.
- 179 degrees.
Explanation from PART66Online
Deviation is named east or west according to the side of magnetic north on which compass north lies, and easterly deviation is counted as plus. Easterly deviation makes the compass read low, so the compass heading for a magnetic heading of 180 degrees is 180 minus 1, which is 179 degrees. Steering 181 would apply the deviation the wrong way, and steering 180 would ignore it.
B
boholbo asked · 6 Jun 2025
To compensate the +1 degree error, the pilot must fly 181 degrees if he wants to head 180 degrees.
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