Parallel sailing

By parallel sailing we mean travelling along a parallel of latitude from one place to another. This means that one would either be travelling 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…

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Plane sailing

When we refer to plane sailing we mean sailing from one position to another where the latitude and longitude of each is different to the other.  Because we are using a mean latitude, this method is not very accurate over long distances and should be confined to distances of 600…

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