I've played with the SI some on my Striker 7SV, but haven't had much success finding brush with it.

What settings should I try? Seems like things are a little clearer on 455khz than 800, so I leave it there. I can see bottom contours and trees pretty easily, but brush piles don't seem to show up that well.

How sensitive are these units to interference? The 7SV runs on the starting battery. My outboard is older and I don't believe it has resistor plugs. Any chance these could be hindering the SI?