On the MC65, the access to the GPS is done over the software port that is port multiplexer. This allows multiple GPS application to be used simultaneously.
You must ensure that the MC65 under Start->Settings->System folder->External GPS is set to its default settings for Hardware port = (none), Programs port = COM6 any and all GPS applications should be pointing to COM6.
By default, the MC67 has the following settings:
1. Tap > Settings > System > External GPS.
2. In the Programs tab, the GPS program port is set to COM8.
3.In the Hardware tab, the GPS hardware port is set to None