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Extreme Range
The Extreme Range is the maximum distance at which an object of a given height may be seen at sea. (more…)
Distance of the Sea Horizon.
Distance of the sea horizon is greater than the geometric distance to the horizon because:
Earth’s atmosphere is not all the same density. It is denser at the surface of the earth and decreases with altitude. (more…)
Measurement units.
The measurement units used in marine are divided into two systems. (more…)
Length of one minute of arc of a meridian.
Length of one minute of arc of meridian: It is known that a meridian has a form very close to an ellipse. (more…)
Departure East – West
Departure East – West: is the distance in nautical miles measured on the parallel of average latitude, between the meridian of departure point and the meridian of arrival point, in the navigation on the rhumb line.
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