Navigation Problems USCG Question #856 (Set 25)

Determine the distance from LAT 19°54.0'N, LONG 166°36.0'E to LAT 19°54.0'N, LONG 157°54.0'W, by parallel sailing.

Official USCG Answer & Rule Citation

Correct Answer: Option C — 2002.8 miles

Parallel sailing formula $Distance = D\text{Lo} \times \cos(\text{Latitude})$ determines the east-west run along a constant parallel. Converting the total longitude difference across the international date line at latitude $19^\circ54.0'\text{N}$ per Bowditch standards yields $2002.8$ miles.

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