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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 decreases as the latitude increases.

## What is the use of 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)].

## What is parallel sailing formula?

Whenever ship sails on a east or west course, it is called parallel sailing. The distance travelled on this course along parallel of latitude is equal to departure. Parallel sailing formula is **dep/d′long = cos lat**. When ship sails between two places on different latitudes then. Dep/d′long = cos mean lat.

## How is plane sailing calculated?

These relationships are now known as the plane sailing formulae, namely: **departure = distance x sine course d.** **lat.** **=distance xcosine course.**

## When planning to cross an ocean is it always best to use great circle sailing?

Great Circle Sailing is **used for long ocean passages**. For this purpose, the earth is considered a perfect spherical shape; therefore, the shortest distance between two points on its surface is the arc of the great circle containing two points.

There are different methods of locating your position, different plotting methods, and also different ways to determine your course. The system of locating, plotting, and setting a course is called a navigation method. The most common navigation methods are **satnav, dead reckoning, and radar navigation**.