Great circle azimuth bearing and range calculator (with magnetic north)

Input your home lat/long and also the distant lat/long. Results are range in km, nautical and statute miles and azimuth bearing both relative to true north and (approx) relative to local magnetic north at home location.

Longitude: 0.0 to +180.0 deg East, 0.0 to -180.0 deg West (use decimals. NOT deg/min/sec)  Calculator for converting degrees minutes seconds
Latitude: +North or -South. Magnetic bearing is not available beyond +/-60 deg latitude.

Home latitude (degN+, S-) Home longitude (deg E) Distant latitude (degN+, S-) Distant longitude (deg E)
deg min deg min deg min deg min

Azimuth (deg E relative to true north) Azimuth (deg E relative to magnetic north) Range (km) Range (statute miles) Range (nautical miles) Rhumb az (deg E true)

The azimuth angle relative to magnetic north is not available beyond +/- 60 deg latitude due to increasing inaccuracy in my earth's magnetic field model. To get true north here I suggest using a GPS receiver and walking in one direction for a while, then read the true bearing of that line of walking.

The azimuth angle relative to magnetic north calculated above is approximate.

This page has been put on because so many people were finding the satellite dish pointing azimuth and elevation page when they were really searching for a terrestrial great circle azimuth and range calculator.

If you need a BACK BEARING from the distant site back to home do the calculation again, you can't just add 180 deg. The reason for this is that lines of longitude are not parallel to one another, particularly towards the north and south pole.  The errors are small however near the equator and over short distances.

Go here if you want to see a satellite photo or image or imagery of your house or home. The free satellite photo images and maps are provided by a Google map server and using the latitude longitude you may visualise the positions.

There may be errors; any problems or comments please e-mail me Eric Johnston

This lat, long, bearing and range calculator is copyright 1999, 2004 Satellite Signals Ltd

Last revisions:
14 Jun 2003, statute and nautical miles added, magnetic field database updated. 11 Sept 2004, range per degree amended to correspond to ellipsoidal quadratic mean radius in response to comment by Kaimbridge and magnetic field database updated.   Magnetic field model updated 17 April 2006. Heading and link to home page changed to match main website style 1 April 2008. 24Nov2008:  Sequence of lat long for the input location variables reversed.

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