## What is rhumb line in map projection?

In navigation, a rhumb line (or loxodrome) is a line crossing all meridians of longitude at the same angle, i.e. a straight line path derived from a defined initial bearing.

## Which lines on the earth are both great circles and rhumb lines?

It is useful to note that the East-West passage along the equator (90◦) is the same distance for both a great circle route and a rhumb line route. Similarly, when the angle is 0◦ longitude, the line will be along The Greenwich meridian, the prime meridian.

**Is a rhumb line the shortest distance?**

Conclusion. As an imaginary line on the earth’s surface, rhumb lines are a standard method of plotting a ship’s course on a chart. However, a rhumb line is not the shortest distance between two points on a sphere. The shortest distance is called a great circle.

**Is equator a rhumb line?**

All parallels, including the equator, are rhumb lines, since they cross all meridians at 90°. Additionally, all meridians are rhumb lines, in addition to being great circles.

### What is a rhumb line used for?

A Rhumb Line (also known as a loxodrome) is a line on the earth’s surface that crosses all meridians at the same angle. It is used as the standard method of plotting a ship’s course on a chart. This constant course or line of bearing appears as a straight line on a Mercator projection chart.

### What is the characteristics of a rhumb line?

In navigation, a rhumb line, rhumb (/rʌm/), or loxodrome is an arc crossing all meridians of longitude at the same angle, that is, a path with constant bearing as measured relative to true north.

**What is the purpose of rhumb line?**

**Are longitudes rhumb lines?**

Meridians of longitude and parallels of latitude provide special cases of the rhumb line, where their angles of intersection are respectively 0° and 90°. On a north–south passage the rhumb line course coincides with a great circle, as it does on an east–west passage along the equator.

## What is the use of a rhumb line?

Its use in navigation is directly linked to the style, or projection of certain navigational maps. A rhumb line appears as a straight line on a Mercator projection map. The name is derived from Old French or Spanish respectively: “rumb” or “rumbo”, a line on the chart which intersects all meridians at the same angle.

## What is the characteristic of a rhumb line?

A rhumb line path follows a single compass bearing; it is a straight line on a Mercator projection, or a logarithmic spiral on a polar projection. A rhumb line is not the shortest distance between two points on a sphere.

**How do you make a rhumb line?**

The simplest way for you to understand the concept of a Great Circle route is to take a piec e of string to a globe. If you put one end at the origin and the other at the destination and held it straight, paral lel with the equator, you will get one distance known as the ‘Rhumb Line’.

**What is the purpose of a rhumb line?**

### How do you calculate a rhumb line?

When the difference of latitude is large (over 600 n.m.) or the latitudes are close to either of the poles, the middle latitude must be used instead of the mean latitude and in these cases, we have the more accurate formula: Dep. = d. long cos(mid lat).

### What is the difference between rhumb line and great circle?

Simply, when plotting a course over a distance of 500 miles or more it usually makes sense to travel a ‘Great Circle’ route between origin and destination as it will be a shorter distance over the surface of the planet than the straight route – also known as the Rhumb Line.

**What is dLat and dLong?**

The sides of the top triangle are Distance, difference in latitude (dLat) and Departure. Departure is the longitude distance in miles. The lower triangle relates Departure to the difference in longitude (dLong.)

**What is Dlong?**

Advertisements. D’long between 2 places is the arc of equator or angle at center of earth contained between meridians of Longitude of those two places. Departure between two places is the arc of the parallel of latitude contained between the meridians passing through those two places. Departure / D’long = cos Lat.