Which Fish Finder Should I Buy?
Three questions, about thirty seconds, and you get a specific model rather than a list of twenty.
Where do you fish from?
How we pick
The quiz weighs three things, in this order: where you fish, your budget, and what you care about most. Where you fish matters most because it rules options in and out entirely — if you fish from the bank, there is nothing to mount a transducer to, so a castable unit is the only sensible answer regardless of budget.
Above roughly $900 we favour displays that are live sonar compatible, even if you have no intention of buying live sonar today. Forward-facing sonar is where the category is heading, and buying a display that can't accept it later means replacing the screen as well as buying the transducer — often a four-figure difference. You can check exactly what works with your unit using our compatibility checker.
Frequently asked questions
How much should I spend on a fish finder?
For occasional fishing from a small boat or kayak, $100–200 buys a genuinely capable unit with CHIRP sonar and GPS. $400–900 gets you a larger screen with side and down imaging, which is where most serious anglers land. Above $900 you're paying for large touchscreens, detailed mapping and live sonar compatibility.
Do I need GPS on a fish finder?
If you fish the same waters repeatedly, yes — being able to mark productive spots and return to them is often more valuable than a slightly better sonar picture. If you fish one small lake or mostly from shore, you can skip it and save money.
What's the difference between CHIRP, down imaging and side imaging?
CHIRP is traditional sonar and tells you depth and whether fish are below you. Down imaging gives a photo-like picture directly beneath the boat, which is much better for identifying structure. Side imaging scans out to the sides, letting you cover water quickly and find structure you haven't driven over.
Can I move a fish finder between boats?
Portable and castable units are designed for it. A mounted unit can be moved, but you'll need a portable kit with a battery and suction-cup or clamp transducer mount, and re-mounting the transducer each time is fiddly.
Is a castable fish finder good enough?
For bank, dock and ice fishing, yes — a castable is often the only sensible option since there's nothing to mount a transducer to. For boat fishing, a mounted unit gives a continuous picture as you move, which a castable can't match.