If your out by the marina get further out to at least 80' or more of water....usually I fish in 140' but occasionally go to about 80' ish or in between these depths just trying to cover the various water columns depth wise...sometime the bait balls (cisco) will be at different depth depending on the day etc....I use the exact same garmin you have but use it on the split screen and once I mark fish I stay in that area trying various presentations....yesterday the jaw jacker caught nothing but was hot the few other outings....good luck.
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