I have a Fortuna USB GPS, and I've installed the driver for Mac from the Fortuna web site.
The marine charting software expects to see the gps on a serial port, but only the bluetooth serial port that I set up for the mobile phone is listed in the GPS set-up in the charting software.

How do I find this virtual serial port?
I think the driver installed OK.

This is my first Mac, so no idea what to do.

Please help.