Javascript Great Circle Calculator.

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Compute true course and distance between points.

Enter lat/lon of points, select distance units and earth model and click "compute". Lat/lons may be entered in DD.DD, DD:MM.MM or DD:MM:SS.SS formats.

Input Data
Output

: :


Compute lat/lon given radial and distance from a known point

Enter lat/lon of initial point, true course and distance. Select distance units and earth model and click "compute". Lat/lons may be entered in DD.DD, DD:MM.MM or DD:MM:SS.SS formats.

Input data
 
 
 
Output

: :


Spheroid

Enter "user defined" spheroid parameters here:

: :


: from Paulo Santos' Airnav site.