Quote Originally Posted by Buckrub View Post
TM or Transom mounted transducer?

My DF does that sometimes, and it's usually when the transducer has hit something and kicked up one or two 'notches' on the kick-up plastic connector. Repositioning it, and tightening it a bit, helps.
Default Humminbird 859 Depth Trouble
My depth on my Humminbird 859 DI is messing up in the 2d sonar. The image on the screen is correct, shows baitfish and fish like always, shows the bottom and had the depth lines on the screen so I know pretty close the depth. But the actual depth number is going haywire like im in a foot or water or less. It will say its anywhere from 0.9ft-71feet and constantly changing even though the bottom on my screen isnt. Its mounted on my trolling motor. Guess you failed the tests back in school when teacher asked what color was Grant's white horse.