Assembly: System.Device (in System.Device.dll)
The Haversine formula is used to calculate the distance. The Haversine formula accounts for the curvature of the earth, but assumes a spherical earth rather than an ellipsoid. For long distances, the Haversine formula introduces an error of less than 0.1 percent.
Altitude is not used to calculate the distance.
Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.