I'm pretty certain he's asking if having one is worth it or not for fishing the brackish creeks.
Do they serve a purpose? Yes. Are they essential? Not at all. I use mine to tell me the water temp of where I am and in the winter time to find the deep ledges when looking for stripers. As far as chasing trout, pups, flounder and warm water stripers I bet I don't look at my depth finder 5 times throughout the day.
Having atleast a basic depthfinder on a boat is essential IMO. If nothing else it will tell you how deep the water is that you are running your boat in. If you see it go from 20ft to 2 ft you know you are out of the channel and need to do something before you get yourself stuck.
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