‘Sailings’ is a term given to various methods used to determine courses and distances to be steamed when traveling from one geographical position to another.

There are six different “sailings”, ie Parallel, Plane, Middle Latitude, Mercator, Great Circle, and a combination of Great Circle and one of the others.

By parallel sailing, we mean travelling along a parallel of latitude from one place to another. This means that one would either be traveling directly westward or eastward [270° (T) or 090° (T)].

The distance along a parallel of latitude between two particular meridians decreases as the meridians converge towards the poles.

The distance decreases as the latitude increases. Because of this, the distance along a chosen latitude is referred to as “Departure” and it is expressed in nautical miles.

This video contains the understanding of the parallel sailing formula and explains how to calculate the vessel traveling distance when sailing along the parallel latitude.

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