I never understood this obsession with these systems. Unless you are planning on tweakin the whole propulsion plant, and using the system temporarily to establish norms, it usually just end up being a waste of money. It all depends on the speed of the vessel, the rest is known. If you have the time, slow down, saves fuel. But then again its Coast Guard, like fire trucks, fuel is not really an issue.
BC Ferries uses a the only system I though was good idea from a Nanaimo company, I forget the name now, but they would program the arrival time, and the fuel management system would dictate the main engine speed. Having display of how much fuel is consumed, and pretty little lights and fancy pipework, is consistently ignored by the navigator.
Certified Marine Engineer and Webmaster
Martin's Marine Engineering Page