Great Circle sailing calculation with determination of intermediate points

Saling tutorial
Using an example where the vessel departs from the south latitude and arrives in the north latitude, this video shows how to calculate the
1) Great circle distance between the two given positions;
2) Initial course angle;
3) Final course angle;
4) Position of the vertex’
5) Longitude when the latitude of the intermediate point is given; and
6) Latitude when the longitude of the intermediate point is given.

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Contents of this video will benefit mariners preparing for exams (written and oral examinations).
Mariners will also benefit by watching the following videos:
Great circle sailing:
Great circle sailing (example 2):
Great circle sailing (example 3):
Great circle sailing (Example 4):
Determining the final (and Initial) course angle:
Composite great circle sailing:
Composite great circle sailing (Example 2):
Calculate departure along a parallel of latitude:
Calculate d’lat and d’long (Plane sailing):
D’lat and m’lat calculation:
Plane sailing (example 1):
Plane sailing (example 2):
Plane Sailing (example 3):
Plane Sailing (example 4):
Mercator sailing (Example 1):
Mercator sailing (Example 2):
Mercator Sailing (Example 3):
Mercator Sailing (Example 4):
Calculate mean latitude:
A trick to remembering formulas in sailings:
Compare plane sailing to mercator sailing:
Day’s work (wind and leeway):
Horizontal sextant angles:
The use of position lines:
Rising and dipping of lights:
Horizontal angles:
Compass error:
Tidal window calculations:
Secondary port tide calculations:
Explaining interpolation of second port tide calculation:
Simplified harmonic method of tide calculation:
Simplified harmonic method (Theory):
Tides (General Theory):
PZX triangle:
Venus as morning or evening star:
Circumpolar bodies (Theory):
Circumpolar bodies (worked example):

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