Hi there just saw your message re fish finders I suggest you read the following webpage for more information and tips on what to look for to come to a final decision. Cheers have a good day - Cliff
https://www.bassresource.com/fishing/fishfinder-buying.html
I have never fished for bass my fishing days were way back in UK, beach casting and sea fishing, not as sophisticated as you fresh water guys. hehehe