I had heard of several agencies using RIB's so just needed some actual examples.Will have to check out Greenpeace next.
We have a very landlocked bay here and they are even complaining that the cruise ships are running their diesel generators while in port and adding to the pollution. So really getting strict.
Seems a RIB with low emision engines would suit the job here.
Read a bit on LPG conversions also,but seem mixed results
I will check on some of the environmental agencies and see if they have any info;