Quote Originally Posted by rnvinc View Post
I think your test would be a good learning experience ...

Rickie
I think this test is just a natural extension of what Kosmo has been doing with the ping pong balls. Heck he can see 4 balls AND the knots!! I just don't know if sonar can see the air inside a piece of PVC the way it can a PP ball. Maybe if PVC won't show up, I'll glue a tennis ball onto my cover and try that?