19 The following areas summarize the recommended
training in celestial navigation:
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.1 correctly adjust sextant for adjustable errors;
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.2 determine corrected reading of the sextant
altitude of celestial bodies;
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.3 accurate sight reduction computation, using
a preferred method;
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.4 calculate the time of meridian altitude of
the sun;
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.5 calculate latitude by Polaris or by meridian
altitude of the sun;
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.6 accurate plotting of position line(s) and position
fixing;
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.7 determine time of visible rising/setting sun
by a preferred method;
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.8 identify and select the most suitable celestial
bodies in the twilight period;
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.9 determine compass error by azimuth or by amplitude,
using a preferred method;
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.10 nautical astronomy as required to support
the required competence in paragraphs 19.1 to 19.9 above.
20 Training in celestial navigation may include
the use of electronic nautical almanac and celestial navigation calculation
software.