Hi Dietmar,
1. Make sure that the Destinator 3 software is not running. Only one application can use the COM port at the same time. Make a soft reset to make sure of that.
2. Make sure you have the correct cables to connect GPS Mouse to PDA. You may need a gender-changer to connect the PDA and the GPS Mouse.
3. Go under Menu > Settings > Hardware > Terminal. See if you receive any sentences from the GPS. If you do, all is well with the connection between PDA and the GPS.
If you don't, you need to find the right Port Settings. If it is connected to the port at the bottom of the PDA it will use the COM 1, you might have to guess the baude rate, but make sure you start with the default COM 1, 4800, 8, None, 1 settings under Port Settings in the Menu > Settings > Hardware dialog.
SeeYou Mobile 
