Re: Radar underwater

On of the things not mentioned as "blocking radar" in the other posts is

WATER. More than a couple of feet and the radio waves are absored by the

water. Any vehicle using a radar under water would only heat the water. 
(Microwaves folks :o)

A vehicle would need either optical, (blue-green laser, LiDAR etc. ) or
a 
dedicated sonar system to be able to "see" underwater. You might also 
remember the show "SeaQuest DSV". The "Whisker" concept is something
that 
works. Small remotes giving you a longer base line for more accurate
fixes 
and also capable of carrying short range sensors, (the optical's above)
close 
enough to use while still extending your reach.

Randy