My Hummingbird 4ID finally don't have enough black in the screen to make a pic, after 20yrs or so? What do you recommend in about a 150$ range, mainly looking at the bottom in no more than 50/60 ft of water? Can.t seem to find one that comes with a trolling mt. mount transducer, they sell them as an option, but at high$ compared to original unit. Can fab a mount to put transom mount transducer but will have about 20 ft of cable wrapped around trolling that I don't want. Any good ideas, THANKS

I was looking at Humminbird, but at higher dollar ones and saw that if you want a different transducer than standard you can do a trade with them. Not sure just how it works but may be worth checking it out with them.