The refraction correction table given in the Nautical Almanac is based on a standard or average atmospheric density with a temperature of 50°F (10°C) and atmospheric pressure of __________.
Official USCG Answer & Rule Citation
Correct Answer: Option B — 29.83 inches (1010 millibars)
Under USCG National Maritime Center examination standards, the accepted correct answer is: 29.83 inches (1010 millibars).
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