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Yachtmaster Ocean revision module 4 of 10

SUN

Sun Sights and Position Lines

Intercept method principles, assumed position, azimuth, plotting a position line, and transferred lines.

sun sightintercept

3 guided lessons · 8 practice questions · 8 flashcards

3 outcomes · self-guided revision
  • Explain intercept method principles, assumed position, azimuth, plotting a position line, and transferred lines.
  • Apply sun sight to a realistic onboard situation.
  • Recall the core check: ho is observed altitude after corrections.

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Lesson 1 of 1

Intercept Method Logic

The intercept method compares what you observed with what you would have observed from an assumed position. If observed altitude is greater than calculated altitude, you are closer to the body's GP than the assumed position; if lower, you are farther away.

The azimuth gives the direction towards the body's GP. The intercept moves the position line towards or away from the body, and the line is drawn at right angles to the azimuth.

  • Ho is observed altitude after corrections.
  • Hc is calculated altitude from the assumed position.
  • Intercept is Ho minus Hc.
  • Plot towards if Ho is greater; away if Ho is lower.
StepQuestionOutput
Assumed positionWhere am I reducing from?Chosen AP
Almanac/tablesWhere is the body and what should I see?Hc and azimuth
CompareIs Ho higher or lower than Hc?Intercept
PlotTowards or away from body?Position line
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