A fishfinder or sounder (Australia) is an instrument used to locate fish underwater by detecting reflected pulses of sound energy, as in sonar. A modern fishfinder displays measurements of reflected sound on a graphical display, allowing an operator to interpret information to locate schools of fish, underwater debris, and the bottom of body of water. Fishfinder instruments are used both by sport and commercial fishermen. Modern electronics allows a high degree of integration between the fishfinder system, marine radar, compass and GPS navigation systems.
BABY STEPS: You don't have to spend a ton of money or be an engineer to get your kayak electrified. Here we have the Lowrance X50DS. The fishfinder and the installation kit will run around $250. Look at what you spend for a rod/reel/braided line, and you'll find this kit is certainly affordable. The display is 4-level grayscale, and the battery pack contains AA batteries. However, what it may lack in fashion it makes up by function. The battery pack goes in a dry bag, and the unit itself is easily removed at the end of the day. It features a built in temperature sensor and 120 degrees of wide angle coverage.

The side scan will scan much more around the boat but are not as effective, especially in deep water. For this reason alone, you may feel the need to buy two seperate fish finders but some premium models have both side and down scanning capabilities. This means you can usually view both at the same time for a very detailed scan around the boat in all directions.
Once you've got your rod and reel setup how you want it, pull the right fishing line and tackle for the waters you're fishing from your tackle box and get to work. Add a sinker for more depth or a floater that can help track your line. A thick fishing line and hook will provide more resistance for reeling in larger fish. If nothing's biting from the shore, why not load up your fishing tools into a fishing boat or raft and try exploring further out. Customize the power of your boat with a trolling motor or do things the old fashioned way with a canoe and paddles.

The final point to remember when you are looking out for fish arches is that it doesn’t need to be a full arch. Half arches (like the ones shown in the screen shot above) also show that there is fish. In ourtutorial on how sonars work, we explain in detail why sometimes you get a full arch and sometimes you get a half arch. The short answer is that you will get a full arch if a fish swims through the whole of your sonar cone, and a half or partial arch if they only swim through part of it.
A sinker or plummet is a weight used when angling to force the lure or bait to sink more rapidly or to increase the distance that it may be cast. The ordinary plain sinker is traditionally made of lead. It can be practically any shape, and is often shaped round like a pipe-stem, with a swelling in the middle. However, the use of smaller lead based fishing sinkers has now been banned in the UK, Canada and some states in the USA,[4] since lead can cause toxic lead poisoning if ingested. There are loops of brass wire on either end of the sinker to attach the line. Weights can range from a quarter of an ounce for trout fishing up to a couple of pounds or more for sea bass and menhaden.
In operation, an electrical impulse from a transmitter is converted into a sound wave by an underwater transducer, called a hydrophone, and sent into the water.[3] When the wave strikes something such as a fish, it is reflected back and displays size, composition, and shape of the object. The exact extent of what can be discerned depends on the frequency and power of the pulse transmitted. Knowing the speed of the wave in the water, the distance to the object that reflected the wave can be determined. The speed of sound through the water column depends on the temperature, salinity and pressure (depth). This is approximately c = 1404.85 + 4.618T - 0.0523T2 + 1.25S + 0.017D (where c = sound speed (m/s), T = temperature (degrees Celsius), S = salinity (per mille) and D = depth).[4] Typical values used by commercial fish finders are 4921 ft/s (1500 m/s) in seawater and 4800 ft/s (1463 m/s) in freshwater.
A compact, affordable combination GPS/Fishfinder. Simrad’s GO 5XSE is an all in one solution to quality chartplotting and sonar. The included Med/High/DownScan transducer provides exceptional sonar imaging in near-photo like detail. Multiple Charting options from Insight, Navionics and C-Map enable the Simrad GO5 to go anywhere the water takes you.
Detection range (depth) of a fish finder depends upon the frequency used for ultrasound transmission. In principle, the higher the frequency of ultrasound, the shorter the propagation range can be. The wavelength of high frequency ultrasound is short, and its directivity angle is narrow, which enables detailed searches, but it attenuates significantly while travelling through water. Low frequency ultrasound is characterised by its long wavelength, wider directivity angle and high level of tolerance toward underwater attenuation, hence enabling wide-area-searches in deeper water. To summarize, you can choose low frequency if you are searching in deep water and high frequency if you are conducting a detailed search in shallow water. Further, when using low frequency ultrasound, you may be able to conduct more precise deep-water searches by adding an optional Power Adapter, which amplifies the transmitter power to a few kilowatts. Please note, however, that when using the Power Adapter, a dedicated transducer capable of handling higher transmitter power will be needed.
2-4 PERSON CAPACITY: Comfortably sized 2-4 people capacity including set-up dimensions of 81" x 71" and 71" high with plenty of room to fish and even stand up inside of.|POP-UP STYLE SETUP: Sets up super quick and tears down just as easily by simply pulling up on the roof and then on all four sides so youÆll be good to go in minutes.|FULLY INSULATED FABRIC: Features 300 denier insulated oxford fabric with frost-resistance up to 22 degrees Fahrenheit to keep you warm no matter the weather.|DURABLY DESIGNED: Includes solid fiberglass poles, diecast hubs, and heavy duty zippers designed for repeated use plus 4 strong ground stakes and 4 pull ropes.|WELL-VENTILATED ACCESS: Two zippered doors on opposite ends and hook and loop fastened windows allow for easy access and provide a well-ventilated.