# Rhumb Line Distance Calculator

Calculate the distance between two points following a rhumb line (constant bearing course)

> Canonical page: https://elysiatools.com/en/tools/rhumb-line-distance

- **Category:** Geography

- **Keywords:** rhumb line, loxodrome, distance, navigation, constant bearing, mercator

## Overview

The Rhumb Line Distance Calculator allows you to determine the precise distance between two geographic coordinates by following a loxodrome, or a path of constant bearing. Ideal for maritime and aviation navigation, this tool calculates the distance along a fixed compass heading rather than the shortest great-circle path.

## Inputs

- **Start Latitude** (number): Enter starting latitude (-90 to 90)
- **Start Longitude** (number): Enter starting longitude (-180 to 180)
- **End Latitude** (number): Enter destination latitude (-90 to 90)
- **End Longitude** (number): Enter destination longitude (-180 to 180)
- **Distance Unit** (select)
- **Decimal Precision** (number): Number of decimal places

## When to use

- When planning a voyage or flight path that requires maintaining a constant compass bearing.
- When comparing the distance of a loxodromic path against a great-circle route for navigation planning.
- When working with Mercator projection maps where rhumb lines appear as straight lines.

## How it works

- Enter the latitude and longitude coordinates for both your starting point and your destination.
- Select your preferred unit of measurement, such as kilometers, miles, or nautical miles.
- Adjust the decimal precision setting to define the level of detail required for your calculation.
- Click calculate to generate the distance based on the constant bearing between your two points.

## Use cases

- Maritime navigation planning for vessels maintaining a fixed compass heading.
- Aviation flight path analysis for long-distance travel.
- Geographic education and mapping exercises involving Mercator projections.

## Frequently asked questions

### What is a rhumb line?

A rhumb line, or loxodrome, is a path on the Earth's surface that crosses every meridian at the same angle, allowing a navigator to maintain a constant compass bearing.

### Is a rhumb line the shortest distance between two points?

No, the shortest distance between two points on a sphere is a great-circle route. A rhumb line is typically longer but easier to navigate.

### Which units are supported?

The tool supports kilometers (km), miles (mi), nautical miles (nm), and meters (m).

### What are the coordinate limits?

Latitudes must be between -90 and 90 degrees, and longitudes must be between -180 and 180 degrees.

### How does this differ from a great-circle calculation?

Great-circle calculations find the shortest path, while rhumb line calculations maintain a constant heading, which is more practical for traditional navigation.

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