If you have good trouble shooting experience with Windows and have the $600+ for Nobeltec, it is indeed very full-featured software. I crewed one delivery with it on the skipper's pc, and the only problem was that it has so many unfathomable features that we all kept getting lost in the menus and submenus. But then, a sort of shotgun approach to building in zillions of obscure features has been a religion with MS folks for many years.
For a lot less $ one can use something like GPSNavX
GPSNavX™ - Marine Navigation & Charting Application for OS X
on any Mac (even my "old" G4 iBook) and plug in the same BU-353 usb gps receiver (about $70.) that I have used for years on our boat. You can also plug in an AIS black box for somewhere around $200.
There are other choices, but I have no personal experience with them.
FWIW, if I were going to have a dedicated computer system on the boat, I would nowadays install the newest MacMini for $699. Of course even that may be supplanted quickly by the onrushing nav. capabilities of the iPad!
ps: with a yacht large enough to have a professional captain whose judgement you trust and rely on, you probably do not want to step on his computing toes too much, as it were!