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# Distance and Azimuths Between Two Sets of Coordinates Print Email

This function will calculate the distance and azimuth (referenced to True North) between two sets of coordinates on the Earth.  Bearings or azimuths start with 0 degrees toward true north, 90 degrees east, 180 degrees south, and 270 degrees west (clockwise rotation).

The terminal coordinates program may be used to find the coordinates at some distance, given an azimuth and the starting coordinates.

The shortest distance between two points on the surface of a sphere is an arc, not a line.  (Try this with a string on a globe.)  In addition, the azimuth looking from Point B to Point A will not be the converse (90 degrees minus the azimuth) of the azimuth looking from Point A to Point B.

Applicants will find this program helpful in determining compliance with the minimum spacing table in 47 CFR 73.207 for FM stations or 47 CFR 73.610 for television stations.  DXers (long distance listeners and viewers) can use this function to find the locations of, and best receive antenna orientation for, distant stations.  Station coordinates may be found through the AM Query, FM Query, or the TV Query.

##### Find Distance, Azimuths Between Two Points
Enter the Initial Coordinates in Degrees, Minutes, and Seconds:

Latitude      North    South
Longitude   West     East

Enter the Second Set of Coordinates in Degrees, Minutes, and Seconds:

Latitude      North    South
Longitude   West     East

Choose Method of Calculating Distance:

Distance per Sections 73.208 (FM) and 73.611 (TV)
( Valid out to a maximum distance of 475 km / 295 miles per Section 73.208(c) )

Distance per the Great Circle Method (AM)

Options for FM Radio only:

Spacings per the U.S-Canadian Agreement for FM Broadcasting
(FM in Canadian Border Zone only)

Spacings per the 1992 U.S.- Mexican Agreement for FM Broadcasting
(FM in Mexican Border Zone only)

Note: For these last two methods of spacing determination,
latitude will be reset to N and longitude to W.

Questions on Distance Between Coordinates may be directed to Dale Bickel, dale.bickel@fcc.gov.

Information about AM and FM broadcast radio stations is available at the Audio Division on the FCC's website, and at Broadcast Radio Links.  Information about television stations is available at the Video Division.

FCC > Media Bureau > Audio Division and Video Division

Reviewed: November 5, 2014
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