Back when everyone else was rocking a 3.5-inch grayscale fishfinder, Gary sported a color 7. He always seemed to catch fish. One day I had the nerve to ask him, “Hey Gary, how much did that thing cost?”
“More than the kayak,” was the deadpan response.
That was years ago. Since then, sonars are more and more capable and feature rich, for less scratch. A Lowrance Hook-7 will run you $449, much less than the kayak. Downscan and side imagining are commonplace. Over time, screen sizes grew until Gary was no longer the exception, he was the rule.
So how big is too big? The answer depends on your bank balance and risk tolerance as well as the water you fish and the kayak you captain. Five to 7 inches seems like the sweet spot for kayak use. The screens are wide enough to offer high-resolution readability, yet compact enough to stay out of the way of a cast—or your foot.
These days the better question might be, “How big is the transducer?” For peak performance, it’s best to mount a modern transducer in direct contact with the water. Some transducers require adapters such as the Lowrance Ready Total Scan plate to fit properly. Alternatively, kayak anglers can go the MacGyver route and craft their own adapters. Where there is a will and there are fish to be caught, there’s a way. Just ask Gary.