# What is parallel sailing in navigation?

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## What is parallel sailing?

: spherical sailing in which the course is along a parallel and departure is the product of cosine latitude times the difference of longitude —opposed to meridian sailing.

## What is parallel sailing and plane sailing?

Whenever ship sails on a east or west course, it is called parallel sailing. … When ship sails along a rhumb line, it is called plane sailing. Rhumb line is a line on surface of earth which cut all meridians at same angle.

## 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.

## What are meridional parts?

: the linear length of one minute of longitude on a Mercator chart.

## What is Traverse sailing?

: plane sailing in which a ship follows two or more courses in succession with the difference in latitude and departure being added algebraically to find a single resultant course and distance.

## Why is it called plane sailing?

To make calculations simple, sailors assumed that the ship was sailing on a flat or a ‘plane surface’. The original expression was, in fact, ‘plane sailing’. Since spelling had not been standardised, the two words ‘plain’ and ‘plane’ were used interchangeably.

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## What is mean latitude sailing?

[′mid·əl ¦lad·ə‚tüd ‚sāl·iŋ] (navigation) A method of converting departure into difference of longitude, or vice versa, when the true course is not 090° or 270° by assuming that such a course is steered at the middle latitude.

• Pilotage.