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Harry
Try setting the comm port for the GPS unit to Com2 - ie force it to use Com2 instead of whatever the default that Windows might set it up to - also if you have only USB ports (ie no RS232 serials; most newer model PCs are like this) connect the GPS on its on USB port and not "shared" on a USB hub
I had a similar problem initially and solved it by the above method
Just in case - it's obvious though - might as well ask; did you save the settings after changing to NMEA format?
HTH
Cheers
Bill
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