OUPV & 100-Ton Master · Navigation
The compass error found by comparing a charted range's true bearing with the gyro/magnetic bearing observed when the marks are in line is most reliable because a range:
- AIs always lit
- BProvides a precise, known true bearing with no parallax when the two marks align✓ Correct
- CEliminates the need for charts
- DIs unaffected by tide
Explanation
When the two marks of a charted range are exactly in line, the true bearing between them is known precisely from the chart, giving a clean reference to compare against the compass and determine error — a standard way to check deviation underway.
Authority: Bowditch (Pub. 9), compass checks
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