from their website:
The interface is very scalable and can run in any resolution greater than 1024*768. Basically, the available screen resolutions reported by DirectX are only a restriction to the game. This means the game can run at any aspect ratio, on any monitor: 4:3, 5:4, 16:9, 16:10 etc. So, go ahead and buy the HD monitor you want, Silent Hunter 4 will make full use of it. We tested the game and looks great on 37" HD monitors.