Chart Navigation & Plotting · Running Fix
In the 'doubling the angle on the bow' method, the distance run between the two bearings equals:
- ATwice the distance to the object at the second bearing
- BThe distance off the object at the time of the second bearing✓ Correct
- CHalf the distance to the object
- DThe radius of the turn
Explanation
When the relative bearing to an object doubles (e.g., 30° then 60° on the bow), the run between the two bearings equals the distance to the object at the time of the second bearing — a quick way to find distance off without a chart plot.
Authority: Bowditch, American Practical Navigator (Pub. 9), special bearing techniques
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