Hi Mike,
Sorry that I did not catch this sooner. I have a subscription on this forum, but sometimes I get notice and sometimes I don’t.
The NAV2CSV is part of the download program of one of the latest updates. You just open it after the installation and it has a little window on the screen. You then open windows explorer and take the *.nav file that you want to convert with the left mouse button, you drag and drop it on top of the window and it will automatically create a *.csv file in the same folder from where you dragged the nav file from. You can also do this from the desktop.

Gerhard