# How is plane sailing calculated?

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## What is the limit distance for a plane sailing method?

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 nautical miles or less.

## What is the difference between plane sailing and Mercator sailing?

Plane sailing is not intended for distances of more than a few hundred miles. … Mercator sailing provides a mathematical solution of the plot as made on a Mercator chart. It is similar to plane sailing, but uses meridional difference and difference of longitude in place of difference of latitude and departure.

## Why is it called plane sailing?

In the past, in order to determine distance, calculations were made based on the assumption that the earth was flat and not spherical. 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’.

## What is short distance sailing?

Short distance sailing is a term which is applied to sailing along a rhumb-line for distances less than 600 nautical miles.

## What is the distance between 2 longitudes?

A degree of longitude is widest at the equator with a distance of 69.172 miles (111.321 kilometers). The distance gradually shrinks to zero as they meet at the poles. At 40 degrees north or south, the distance between a degree of longitude is 53 miles (85 kilometers).

## 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.

## How do you find the difference in time between two longitudes?

The time difference between each longitude (each degree) is 4 minutes. So if it is 12 noon at Greenwich (0 degree), it would be 12:04 pm at 1 degree meridian and so on. In India, the standard meridian is 82-and-half degree.