Odd readings on FL-8

[Jaybird]

I'm running an old FL-8. I've noticed an odd phenomenom for a long time now. When I jerk my jig up quickly, like in a missed hook-set, a lot of clutter appears on the screen, mostly in the upper part of the water column. It lingers for a while and then fades away. Seems to disappear quicker if I reel up.

Anyone else seeing this? If so, any idea what causes it?

[BartmanMN]

Those are air bubbles.

[Stringerless!]

+1. I have an old vex too and only see this with bigger lures. I can reduce it by ripping the lure hard a few times on the way down.

[BobT]

I'm running an old FL-8. I've noticed an odd phenomenom for a long time now. When I jerk my jig up quickly, like in a missed hook-set, a lot of clutter appears on the screen, mostly in the upper part of the water column. It lingers for a while and then fades away. Seems to disappear quicker if I reel up.

Anyone else seeing this? If so, any idea what causes it?

You say the clutter appears in upper part of the water column. Another thought might be the line and lure causing a ripple in the water and this ripple or wave is being picked up by the sonar unit. Sonar works by sending a sound wave and based on the time it takes for the echo to return calculates the distance to various objects. A wave in the water column could reflect an echo back to the receiver.

[BoxMN]

I think it happens more with fireline/braid than mono as well.

[wishing for walleyes]

I think it happens more with fireline/braid than mono as well.

It sure does. I quit using fireline because of this.

[NCLaker]

Weird, by do you think fireline/braid makes that problem worse?

I don't use it anyways because of how bad it ices up when I'm hole hopping.

[hamms-scooter]

Air bubbles for sure.