Chart Navigation & Plotting · Position — Difference of Latitude
A vessel goes from 34°10'N to 35°40'N. The difference of latitude is:
- A1°30' (90')✓ Correct
- B1°50'
- C0°30'
- D69°50'
Explanation
35°40' − 34°10' = 1°30' of latitude = 90 nautical miles (since 1' of latitude = 1 nm). Same-name latitudes subtract; opposite names add.
Authority: Bowditch (Pub. No. 9)
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