Quote Originally Posted by rnvinc View Post
make your own "artificial fish" for testing the making of arches...

Take a fish sized object (coffee cup or something similar)...
Attach "artificial fish" to line...
Lower "artificial fish" into water at a certain depth...
Pass "artificial fish" thru sonar's cone at a steady rate...
Try different depths....
Try different unit settings....

At least with this test ..... You know for a fact that the "artificial fish" is passing thru the cone ...

Rickie
good tip--have to wait until next spring to try it--if i don,t forget--