I have been told by a couple of dealers that the AIS (and also the Navtext receivers) are not fully waterproof and there was grave concern for their reliability if mounted on a RIB console. Otherwise seems like a better option than having nothing for boats without radar but as Gingercoastie mentions there is a chance the 'active' signals may not be generated at some point making faith in the system less than 100%. Still, they are only small, easily fitted and seem to work well most of the time. The next generation should have A and B AIS, with leisure and smaller commercial craft being able to use transmitters to send out all this heading info, should make for a busy screen with lots of animated sprites whizzing around ! Maybe even icons for different types of boats ! Information overload ! It will also be possible to hook them up to a chartplotter and see everything in relation to the chart too, this is available if using the black box type AIS receivers and a laptop/PC with some chartplotting software.