In solutions of the sailings, the nofollowing quantities are used: Latitude (L). The latitude of the point of departure is designated ; that of the destination, ; ; and latitude of any point on a great circle, .
Mean latitude (). Half the arithmetical sum of the latitudes of two places on the same side of the equator.
Middle or mid latitude (). The latitude at which the arc length of the parallel separating the meridians passing through two specific points is exactly equal to the departure in proceeding from one point to the other by mid-latitude sailing. The mean latitude is used when there is no practicable means of determining the middle latitude.
Difference of latitude (l or DLat.).
Meridional parts (M). The meridional parts of the point of departure are designated , and of the point of arrival or the destination, .
Meridional difference (m).
Longitude (λ). The longitude of the point of departure is designated ; that of the point of arrival or the destination, ; of the vertex of a great circle, ; and of any point on a great circle, .
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