Originally Posted by codprawn
I was thinking more of FLIR goggles or helmet cam. As to range you don't get much of a range on a RIB anyway as you are so low down.
FLIR will see through fog to a certain extent and is awesome at night of course. I think it would get used FAR more than RADAR!!!
Assuming an antenna height of 2m above sea level and flat conditions, you should be able to pick up a 1m high target at about 5 nM, a 10m high target at about 10 nM and the Needles (141m) at close to 30 nM. Obviously if wave height is significant this will be reduced, or at least intermittent.
In my experience with boat mounted thermal imaging kit (admittedly I haven't trialled the latest generation of kit), performance is very limited in fog, even heavy rain has a marked effect. In thick fog when you really need it, performance is not that good at all. Maximum range I would say is maybe 1 nM.