On 15 August your vessel is enroute from Bombay, India, to San Francisco, CA. You are steering course 020°T and making a speed of 20.0 knots. Your 1830 zone time DR is LAT 26°13.0' N, LONG 135°18.0' W. You observed 3 celestial bodies. Determine the latitude and longitude of your 1935 running fix.
Official USCG Answer & Rule Citation
Correct Answer: Option A — LAT 26°48.1'N, LONG 135°20.7'W
Advancing celestial lines of position across the time interval using vessel course and speed vectors resolves the running fix coordinates. Dead reckoning updates account for the set and drift over the elapsed hour.
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