I seem to be having a problem with my 998 that I don't believe was there before I updated the firmware from 7.51(???) to 7.67 this year.
On the attached picture, you will see a thick line at around 2 feet. The deeper the water I'm in the narrower the line is. Also, I don't seem be marking anything suspended, just the bottom and the colors don't look correct to me. I'm am using a "Y" cable with the side imaging transducer and a thru-hull high speed transducer.
Any idea what might be causing this or is there a setting I'm not remembering to set, since the firmware update requires a "reset to defaults"?