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NorthLat,SouthLat,EastLon,WestLon: Cardinal;
......
NorthLat := 54 * 1000000;
SouthLat := 3 * 1000000;
EastLon := 136 * 1000000;
WestLon := 72 * 1000000;
......
if (A8GPSData.GPSData.Lon > EastLon or A8GPSData.GPSData.Lon < WestLon or A8GPSData.GPSData.Lat > NorthLat or A8GPSData.GPSData.Lat < SouthLat) then
Exit;
if (A8GPSData.GPSData.Lon > EastLon) or (A8GPSData.GPSData.Lon < WestLon) or (A8GPSData.GPSData.Lat > NorthLat) or (A8GPSData.GPSData.Lat < SouthLat) then
Exit;