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I have a HB 587ci. Mine had some similar issues. Always with the Sonar. So far it has always been due to the connection of the transducer to the unit. I was getting weird Temp readings, cleaned the connections, fixed the issue. Then I was getting weird depth issues. Cleaned to connections, fixed the issue. Then I was getting inconsistent readings as well as a lot of noise and depth fluctuations. That time it was due to the plug slipping down a little on the mount so the connection was there, but weak. I had to just reset the plugs on the mount.
Check and clean your transducer connector on the wire. clean the male pin transducer connectors on the unit. Check the wire plug on the mount and make sure it is tight and as far up on the mount as it can go.
Don't kmow if that will help, but it worked for me!
Good Luck
Dan
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