GeoConv is a Windows program which converts between the multitude
of various geodetic coordinate systems which are used to represent
the position of a point in the vicinity of the earth. More than 200
geodetic *datums* exist to describe position in local areas or
over the entire earth.

The input position can be specified by its geodetic coordinates (latitude, longitude, altitude) or by its Earth-centered-earth fixed (ECEF) coordinates in the input system. Altitude can be expressed either as geodetic altitude above the ellipsoid, or as height above mean-sea-level. Input and output angular quantities can be specified in degrees-minutes-seconds, or in radians, and linear quantities can be expressed either in meters or feet.

The download file is the program executable. Download it to your hard disk and invoke it by double-clicking the executable or a shortcut to it.