Things in SS'09 needed (in my opinion)
1) Functional radar and ARPA
2) Realistic-looking, functional ECDIS (plotting, routing, etc.), containig complete navigational information (buoys, fairways, leading lights, lighthouses and beacons, racons, etc.)
3) Autopilot (course/track control)
4) Navigation lights, vessel and deck lighting, possibility to switch it on/off
5) Buoyage, leading lights, (with additional lights)
6) Realistic vessel and water dynamics
7) Environments with several ports on the same chart, so that is possible to sail between a number of ports without switchover between two or more environments
Wawe height not restricted at the coastal sailing areas
9) More large vessels and environments
10) Improved AI
11) Tides and currents
12) Advanced mooring system
13) Detailed bridge interior, possibility to switch on/off lighting on the bridge
14) Possibility to change weather during the simulation
15) All berths equipped with mooring boulders
16) Improved mission redactor
I know, that is very hard to do it all, but with that all functions game will be a real navigation simulator!