Thanks for all the replies. It seems that I forgot to specify the format ( _txt) in the Required tab. So, it fixed the problem and now I can import all the waypoints and tracks. However, I am puzzled with one detail. As I mentioned:
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I set my GPS unit to record measurements in UTM,
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the text file prepared by GPS Babel has header showing UTM as projection,
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even if I specify the projection parameter according to PROJ.4 in the Required tab of the module,
the attribute tables for the resultant waypoint and track vector files are in lat/long format. How can this happen? I never work with lat/long.
BÜLENT