CORE_GPS_DISTANCE CORE Endpoint
  /rpc/core/?method=CORE_GPS_DISTANCE  
  Distance between two GPS co-ordinates. Latitude / Longitdue should be in form -33.12345 / Longitude: 151.12345 as per navigator.geolocation.getCurrentPosition etc  
  PARAMETERS TYPE NOTES
  FromLatitude Numeric Mandatory
  FromLongitude Numeric Mandatory
  ToLatitude Numeric Mandatory
  ToLongitude Numeric Mandatory
  RETURN  
  distance In kilometres