I've done a fair amount of night offshore flying, and IMO NVGs are not the best way to do it. Enroute, it's IFR, if not IMC, and the landing is usually to a very highly-lit platform, where the goggles are not necessary or don't work well. If you can't fly in IMC, then you shouldn't be flying offshore at night, NVG or not, because it will be IMC, sooner or later.