In article ,
Rodney Myrvaagnes wrote:

I do see what you describe occasionally with a Raytheon SR 70. I never
have seen the other phenomenon, and I never saw this one with the
previous Furuno 1720.

I don't think it indicates an active radar on the target, because I
have had it happen with big rocks. It usually goes away pretty soon.

Hmmm, sounds like maybe your Magnitron is getting old. Been know to
cause mutiple echo's from a single boat, or rock. If they are infront
of and behind the real target, it is reflections. If it is right or left,
could be what is known as Multiple Pulsing.

Me