Blackhawk19,

Are you running a second sonar unit? If so, try turning it off to see if that helps or not.

Have you updated the software in your 788ci unit? The current available version is 5.400 but if you wait a few days the newer 5.840 version may be available – I am pretty sure that the 5.840 version should have changes in it for shallow water readings.

If you can; test your 788ci unit on someone else’s boat that is running a Humminbird unit. Except for the 3D and new DI models; any other model of Humminbird unit will work for this test (even the Side Imaging units); just be sure to connect only the power and transducer cables for this test. I am trying to rule out your transducer and anything else on your boat as being the cause of this.

Try setting the Surface Clutter menu to a lower numerical setting (this will decrease the amount of surface clutter) as Don G stated but you may have to go as low as a setting of 1.

Try setting the Water Type menu to the “Salt (deep) menu setting. I know that this sounds weird but when you change this menu setting it changes some electrical filtering that the units do and it can help.