Can someone show how to read latitude at offset 0560 and 0564 as an example. I am writting in Visual Basic6.0 and i get an overflow when doing the (65536*65536)Heres part of my codeDim readlat1 As LongDim readlat2 As LongDim lat1 As LongDim lat2 As LongDim ActlLat as long If FSUIPC_Read(&H564, 8, VarPtr(readlat1), dwResult) Then If FSUIPC_Process(dwResult) Then lat1 = readlat1 *90/10001750 End If End If If FSUIPC_Read(&H560, 8, VarPtr(readlat2), dwResult) Then If FSUIPC_Process(dwResult) Then ActlLat= lat1 * 90 / 10001750) + ((lat2 * 90 / 10001750) / (6553 * 6553)) End If End IfThanksDoug

Ok, first recommendation is to split up the equation and simplify it. Here's how I'd try to write it:const LAT_TEMP = 4294180900 '(65530 * 65530)lngTemp1 = ((lat1 * 90) / 10001750)lngTemp2 = ((lat2 * 90) / 10001750)lngTemp3 = lngTemp1 + lngTemp2lngActlLat = lngTemp3 / LAT_TEMPI haven't tested this code, so it may or may not work. See what the value is at each step when you run the code.