VHF's are leased for the specific job by the company i work for in the North Sea normally they use Motorolas but on one one mission Standard Horizons were delivered and we used them for a month and they were most impressive. I gained the feeling they were waterproof! Entec I just realised was a production company I used to work for I think the VHF's are called Entels
Re Rib gizmos The Rib I drive in the North Sea has an all singing and dancing Raymarine Radar/Plotter but the boss keeps the chip in the office in case somebody swipes it!
Re your Opti, I think they are great engines and other than the Etec they haven't any real (2 stroke) competition at the 200 hp plus level. But like any modern engine it uses lots of complicated and expensive bits. So if your engines in Warranty then it's cushty! The 200 HPDI is a nice engine but I have heard bad reports about the bigger HPDI's