Celestial Navigation · Running Fix — Sun
To obtain a position from the sun alone during the day, the navigator:
- ATakes two simultaneous sun lines
- BTakes a sun line, advances it for the run, and crosses it with a later sun line (a running fix)✓ Correct
- CUses only the noon latitude with no other line
- DWaits for two stars at noon
Explanation
Since the sun gives only one LOP at a time, a daytime position comes from a running fix: one sun line advanced along the course and distance run to the time of a second sun line (often the noon latitude), the two crossed to fix the position.
Authority: Bowditch (Pub. No. 9), The Running Fix
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