William G. Andersen wrote:

Just curious...what's the purpose of a marine radar detector?

It tells you when to fire up the ECM suite!

;-)

Actually I have wondered about the viability of an 'available light' radar
set... It would use the transmitters on other vessels and some **serious**
correlation DSP to produce a plot without needing to transmit as long as
someone was radiating in the general area.

Regards, Dan.