# Best answer: How do you get a DMP in Mercator sailing?

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## What is DMP sailing?

It is similar to plane sailing, except that plane sailing is used for small distances. Also, in Mercator sailing, the D. Lat. is expressed in Longitude units, which is the difference of meridional parts (D.M.P.), whereas in plane sailing, the D. Long. is expressed in latitude units or nautical miles.

## 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.

## What are the two categories of Mercator sailing?

In broad terms, there are two main types of sailing, namely, the Rhumb Line sailing and the Great Circle sailing.

• Pilotage.

## 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.

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## 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.

## What is the applicable formula for finding the distance d in mid latitude sailing?

The formula for calculating departure using the middle latitude is: Dep. = d. long cos(mid lat) = 1020 cos (61.15) = 492.17 n.m.

## What is the importance of Mercator sailing?

Mercator Sailing is another method of Rhumb Line Sailing. It is used to find the course and distance between two positions that are in different latitudes from the large D. Lat. and distance.