Fishing for YT in the middle of el nino summer... I'd say fish finder is optional. Any noob can go out and flyline a greenback and catch multiple yt in a day.
Fishing for YT in the winter on deep rockpiles and bait clouds? Fishfinder is essential. Unless you want to blindly fish next to lobster pots all day, without a sonar you aren't even in the game.
#1 tip... use split-screen. Compare 50/83kHz vs 200kHz to confirm your marks. If something shows up on 200 and not on 83, its likely not a big fish.
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