Question 1

How does a fish finder work?

Accepted Answer

A fish finder uses sonar — sound waves — to map what's underwater. The transducer sends pulses of sound down into the water. When those pulses hit something (fish, structure, or the bottom), they bounce back. The display unit measures how long the return takes and draws a picture of what's below. The result is a scrolling image showing depth, bottom composition, structure, and fish — updated in real time as you move across the water.

Question 2

Do I need a fish finder for kayak fishing?

Accepted Answer

Not always — but it changes the game when you use one. In clear, shallow water you can often spot fish and structure visually. But on deeper lakes, large reservoirs, and open water like Lake Erie, a fish finder lets you locate productive structure, track depth contours, mark your best spots with GPS waypoints, and find fish you'd never locate by guessing. Most serious kayak anglers say a fish finder is one of the best upgrades they've made to their setup.

Question 3

What is the best fish finder for a kayak?

Accepted Answer

The best kayak fish finder depends on your fishing style and budget. For anglers new to electronics, the Lowrance Eagle series offers proven sonar, detailed C-MAP charts, and automatic settings that require no setup. For serious anglers who want advanced imaging and room to grow, the Lowrance Elite FS is the most popular choice among tournament kayak anglers. For the highest level of performance including live sonar, the Lowrance HDS PRO delivers complete underwater intelligence. All are available at Can't Stop Kayaking with free shipping to the 48 contiguous states.

Question 4

What's the difference between a fish finder and a chartplotter?

Accepted Answer

A fish finder uses sonar to display depth, underwater structure, and fish. A chartplotter uses GPS for navigation and waypoint marking. Most modern units combine both functions in a single display.

Question 5

What is CHIRP sonar?

Accepted Answer

CHIRP stands for Compressed High-Intensity Radiated Pulse. Instead of sending a single frequency pulse like traditional sonar, CHIRP transmits a continuous sweep of multiple frequencies simultaneously. The result is sharper fish arches, better separation between targets close together, clearer bottom definition, and stronger performance at depth. All current Lowrance units use CHIRP technology.

Question 6

What is the difference between DownScan and SideScan imaging?

Accepted Answer

DownScan sends a thin, wide beam straight down beneath your boat, producing a picture-like image of the bottom directly below you — clearly showing rock piles, timber, brush piles, and bottom composition. SideScan sweeps to the left and right of your boat, covering 100 feet or more on each side in a single pass. DownScan shows what's under you in detail; SideScan shows what's around you across a wide area. For structure fishing, SideScan dramatically speeds up finding productive water.

Question 7

What is ActiveTarget live sonar on Lowrance fish finders?

Accepted Answer

ActiveTarget is Lowrance's live sonar technology that displays a real-time video-like image of what is underwater as it is happening — not a delayed sonar echo. You can watch fish move, see your lure in the water, and observe fish reacting to your presentation in real time. It is available as an add-on transducer compatible with Lowrance Elite FS and HDS PRO displays, meaning you can add it later without replacing your entire unit.

Question 8

How do I mount a transducer on a kayak?

Accepted Answer

There are three common methods for mounting a fish finder transducer on a kayak. A scupper mount feeds the transducer through an existing scupper hole on sit-on-top kayaks — clean and secure. A bracket or RAM arm mount attaches to the gunwale or gear track rail and holds the transducer off the side or stern — adjustable and removable. A suction cup mount is the easiest option for inflatable kayaks and smooth-hulled boats — no drilling, fully repositionable. Sea Eagle inflatable fishing kayaks include built-in accessory mounting points that work with all three approaches. Always check your manual.

Question 9

What size fish finder screen is best for a kayak?

Accepted Answer

7 inches is the most popular screen size for kayak anglers — readable at a glance while paddling and compact enough for most cockpit or RAM mount setups. 5-inch units work well on tight kayaks or minimalist rigs. 9-inch screens offer more detail and are worth considering on larger inflatable fishing boats with more deck space. On a kayak, bigger is better for readability — as long as it fits your mounting setup.

Question 10

Can I install a fish finder on an inflatable kayak or inflatable boat?

Accepted Answer

Yes. Suction cup transducer mounts work well on smooth PVC and Hypalon inflatable hull surfaces. The display can be mounted on a RAM arm attached to an accessory rail or D-ring mount. Sea Eagle fishing kayaks include built-in mounting points compatible with most fish finder setups. Many Lake Erie kayak anglers run full Lowrance Elite FS setups on Sea Eagle inflatable fishing kayaks without any issues.

Question 11

What battery do I need to run a fish finder on a kayak?

Accepted Answer

Most fish finders require a 12V power source. A compact 12V lithium battery rated at 7 to 10 amp-hours powers most units for a full day on the water while keeping your kayak setup lightweight. If you are also running a trolling motor, use a dedicated battery for your fish finder to prevent voltage fluctuations from affecting display performance.

Question 12

What is the difference between the Lowrance Eagle, Elite FS, and HDS PRO?

Accepted Answer

The Lowrance Eagle is the most approachable series — featuring autotuning sonar, detailed C-MAP charts, and a simple interface ideal for anglers new to electronics. The Elite FS adds ActiveTarget live sonar compatibility, advanced Active Imaging with CHIRP, DownScan and SideScan, and a faster processor for serious anglers. The HDS PRO is Lowrance's flagship built for tournament anglers, offering the highest performance, full system integration, and multi-display networking. Check out our blog for more detailed explanation.