ECDIS - How to find rhumb line and great circle course and distance between two positions??

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In this new video on ECDIS, i show viewers how to determine rhumb line and great circle courses and distances between two positions on the earth's surface.
Determining the shortest and safest course and distance is essential for the commercial aspect of shipping.
Contents of this video will benefit mariners preparing for exams (written and oral examinations).
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