Just joined a few days ago, found you while looking for information on a problem with my 989c SI unit. I mainly fish for bass and I never really used this kind of sonar. I upgraded from a Humminbird Wide Optic fish finder to the 989c SI. So there is a little bit of a learning cure to be had. I am sure I will pick it up. From what I have seen so far there is a wealth of knowledge and experience on this form.
My first question is if I am having a problem with my unit is the norm to post your question in the forum for that unit?
Ranger 354V (Joe)