Quote Originally Posted by ab824 View Post
Here lately my hb 587ci says .6ft when the water is muddy. The water is usually around 4 ft or so because I check it with my paddle. Anyone know what gives?
I don't have this model but:

What your depth offset? What is your frequency? Try turning down the sensitivity in shallow water ?

Some of the sonars don't like dirty shallow water. Mine don't.