Jim re-used the title picture for Ports of Call in his abandoned [link=/game/20000LeaguesUnderTheSea.html]20.000 Leagues under the Sea[/link] project.
The german magazine Amiga Magazin did an article on Jim Sachs in their August 1989 issue. They previewed a screen from the project, while it was still in development, and you can clearly see the same sky, mountains and buildings.