Public Function CalculateSurfaceDistance( _
   ByVal Latitude1 As Double, _
   ByVal Longitude1 As Double, _
   ByVal Altitude1 As Double, _
   ByVal Latitude2 As Double, _
   ByVal Longitude2 As Double, _
   ByVal Altitude2 As Double _
) As Double

public double CalculateSurfaceDistance(

   double Latitude1, 

   double Longitude1, 

   double Altitude1, 

   double Latitude2, 

   double Longitude2, 

   double Altitude2

);

public: double CalculateSurfaceDistance(

   double Latitude1, 

   double Longitude1, 

   double Altitude1, 

   double Latitude2, 

   double Longitude2, 

   double Altitude2

);

public double calculateSurfaceDistance(

   double Latitude1, 

   double Longitude1, 

   double Altitude1, 

   double Latitude2, 

   double Longitude2, 

   double Altitude2

);

public: HRESULT CalculateSurfaceDistance(

   double Latitude1, 

   double Longitude1, 

   double Altitude1, 

   double Latitude2, 

   double Longitude2, 

   double Altitude2, 

   double * ReturnValue

);