I've found that the ship sim trial works great using Boot Camp on my MacBook Pro. However, using VMware Fusion it has quite a few bugs (The rain defies gravity, AI ships don't seem to render properly, etc....) it is also noticeably slower. It would be great if V-Step made a Mac version of Shipsim, but it requires re-writing alot of code, and the user base isn't as large so it may not be worth (Financially) writing a Mac native version. Hopes this helps!
~Jake