I have always felt that AIS is a game changer, especially on sailboats. The ability to quickly identify contacts and see their CPA (closest point of approach), course, speed etc. will make offshore watch-keeping much less stressful. If you install an AIS transponder then other vessel should be able to see your details, which is even better. I have recently helped to install a Vesper Marine XB-8000 AIS transponder with WiFi on a friends boat. I believe that this is the best deal out there (for the moment) as the use of iPad apps via WiFi makes the system much more usable.
Once we have installed the Seatalk/Seatalk ng connector to the Raymarine wind instruments and depth/speed we should be able to see wind data, speed and depth on the iPad as well.