Section II: Time and Dead Reckoning

Section II is used to record the Greenwich Mean Time (GMT) and date when the measurement was taken, as well as the dead reckoning (DR) position, which is a best guess of your current latitude and longitude. From our perspective, celestial bodies are constantly moving, so noting the time down to the second of a sextant measurement will yield the most accurate result.

Time is denoted as UT in The Nautical Almanac which is the time standard essentially equivalent to the zone time GMT.

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