I had deleted 7 and reinstalled 1.5 but that kept crashing whenever I went to navigation.
So I reinstalled 7 and 1.5 several times and then deleted the cache and files. I even deleted some of the files manually. 1.5 continued to work but crashed on the navigation screen.
Needing a working version I installed 3.0.125 which worked for my journey.
I just reinstalled 7 and it is now working normally without needing to visit random ferry ports.
A very odd bug. Maybe caused by the jump from 1.5 to 7.0 ?