Portable fish finders are the better choice for those who lease their boat. Also if you ice fish or “fly-in” fish, a portable unit would be more suitable for you. They usually come with their own carrying case and battery power supply. Most of the fish locators come with the transom mount for installation. The portable units come with the transducer already attached to the transom with the use of a suction cup.
CHIRP fishfinders transmit less peak power than a conventional fishfinder, but their wide-band, frequency modulated pulses (130-210kHz, for example) can be very long in duration and put 10-50 times more energy into the water. Using digital pattern matching and signal processing, CHIRP devices achieve unprecedented resolution and target detection. Your ability to resolve individual fish, or separate fish from bottom structure, is now a matter of inches, instead of several feet with traditional fishfinders. See individual fish in groups, instead of a single mass.
Fly fishing tackle is equipment used by, and often specialised for use by fly anglers. Fly fishing tackle includes fly lines designed for easy casting, specialised fly reels designed to hold a fly line and supply drag if required for landing heavy or fast fish, specialised fly rods designed to cast fly lines and artificial flies, terminal tackle including artificial flies, and other accessories including fly boxes used to store and carry artificial flies.
Raymarine’s DragonFly 4 PRO with Navionics Plus Mapping offers Dual-Channel Sonar with CHIRP DownView enabling easy identification of fish and underwater structure with photo-like images. Reaching depths of 600ft with CHIRP DownVision and 900ft with CHIRP Sonar the DragonFly 4 includes a built in GPS receiver and provides accurate coastal navigation data all on a 4.3” Color Display.
Depending on where you fish, sometimes the difference between finding a hot channel where you can always count on the fish to return during a certain time of day and absolutely nothing can be just a few feet. If you’ve ever fished for walleye, you know what it’s like to find those feeding channels or to have the days where you just can’t quite make it work.
By calculating the amount of time between when the sound wave was sent and when it bounced back, it measures the distance and shows it on the screen. If the wave doesn’t encounter anything on its way, it reaches the bottom. If the bottom is soft and it’s just mud and weeds, the signal gets absorbed. A rock bottom will reflect a stronger signal back.
Transducers: Fishfinders operate using a single frequency transducer, dual frequencies, multiple frequencies or a broadband CHIRP system. In general, higher frequencies give the finest detail resolution, the least background noise on your screen and the best view from a fast-moving boat, but don’t penetrate as deeply as lower frequencies. Shallow-water inland anglers generally choose higher frequencies of 200kHz, 455kHz or 800kHz. For maximum depth, use lower frequencies. We recommend 200kHz or higher (up to 800kHz) for water depths up to 200' and 80kHz or 50kHz for deeper waters.
These are very valuable features to target for a range of species, and the good news is, they are easy to spot with a fish finder. As you troll or reel in your device, you will see the depth contour change – don’t forget to use the depth reader on your display (on the Deeper App it’s in the top right corner of the screen) so you can track how quickly the depth is rising or falling.
A fishing line is a cord used or made for fishing. The earliest fishing lines were made from leaves or plant stalk (Parker 2002). Later lines were constructed from horse hair or silk thread, with catgut leaders. From the 1850s, modern industrial machinery was employed to fashion fishing lines in quantity. Most of these lines were made from linen or silk, and more rarely cotton.[3]

Higher frequency transducers have shorter wavelengths and more wave cycles per second, which means you can visualize more details (smaller fish) but have only shallow to moderate depth capacity. One sound wave at 200kHz is slightly longer than 1/4", so a 200kHz sound wave will be able to detect fish as short as a quarter of an inch. A 200kHz transducer has a range of only about 600'. High frequency provides a crisp, clear picture of the bottom with the tradeoff of less depth range. For best resolution, choose 800kHz or 455kHz transducers.
Fish will show up on your screen as an arch (the reason why they are shown as an arch is explained in detail here). But it’s important to remember these arches can vary in size (length and width), and might not be a full arch – look out for those half arches too. The screenshot below gives some nice examples of different arches. They vary in length and width, and some are not full arches, but these are all fish.
Raymarine has a few units that come with a built in GPS. The Dragonfly 4Pro, Dragonfly 5Pro, and Dragonfly 7Pro all have built in GPS. Pay close attention to the unit you are buying, because if you are looking for built in GPS the standard Dragonfly 4 and Dragonfly 5DVS do not have that feature built in. You absolutely have to go Pro to make sure you get the GPS you’re looking for.
Thru-hull: This means a threaded bronze, nylon or stainless steel shaft passes through the bottom surface of the hull. You have several styles to choose from: external football-shaped head with water flow smoothed by a fairing block that also corrects for the dead rise (sideways slope of the hull); or round mushroom head thru-hulls, either semi-flush or flush mounted. These are the most challenging to install, but likely to provide the best signal quality. Displacement power and sailboats generally use thru-hulls.

There is not much that is more relaxing than spending a beautiful day out fishing in your boat. One thing that may make the day even better is a fish finder GPS, so you do not go home without some delicious fish for dinner. On eBay, reliable sellers offer a broad range of new and used fish finders for you to choose from, including brands like Garmin, Lowrance, Eagle, and Hummingbird. With your new color GPS fish finder, you can enjoy a full color display, along with features that may include screenshots, fish and depth alarms, zoom, and dual imaging. The Garmin 546S Marine GPS find finder, for example, features a chart plotter, sonar, an anchor alarm, sunrise and sunset calculator, and marine cartography software included. No matter which fish finder GPS you decide upon, feel confident that you are receiving high-quality products and convenient shipping options that will ensure that your order makes it to you quickly.

Modern rods are sophisticated casting tools fitted with line guides and a reel for line stowage. They are most commonly made of fibreglass, carbon fibre or, classically, bamboo. Fishing rods vary in action as well as length, and can be found in sizes between 24 inches and 20 feet. The longer the rod, the greater the mechanical advantage in casting. There are many different types of rods, such as fly rods, tenkara rods, spin and bait casting rods, spinning rods, ice rods, surf rods, sea rods and trolling rods.


Transmit Power: Transmit power is expressed in watts RMS (root mean squared) and is related to how well you see in silt-laden water, view down to greater depths and successfully resolve separate targets and bottom structure. A 500-watt (RMS) fishfinder should have plenty of power for most coastal applications. Serious bluewater anglers should look for 1,000 watts or more. Inland lake fishermen can see the shallow bottom with only 200 watts.

Lower frequency transducers, with longer waves and fewer waves per second, show less detail (larger fish) but carry more energy and penetrate to greater depths. One sound wave at 50kHz is slightly larger than 1", so a 50kHz sound wave will only detect fish if their air bladders are large, slightly longer than an inch. Lower frequency won’t provide as clear of a picture but will operate effectively in the depths of the ocean or Lake Michigan.
Pinpoint your favorite waypoints and track fish with a fishfinder from Academy Sports + Outdoors. With a detailed black-and white LCD display, you can clearly spot fish as deep as 1,000' as well as track their location with depth finder technology. Water temperature sensors allow you to monitor the biological patterns of prospective catches, letting you pinpoint where they'll be at any time of day. With a waterproof casing, our selection of fishfinders are designed for use on boats or kayaks. Our giant boating and marine shop has an assortment of marine electronics from popular brands, like Humminbird, Garmin marine and Lowrance, can help you reel in the largest catch. Receive notifications for certain depths and types of fish, as well as sonar and mapping software, so you can find exactly what you're looking for.
Points are more gradual than drop offs, but spotting them is just as easy (see the screen shot below). Make sure you maintain a steady speed when trolling or reeling so you get an accurate reading on how steep the incline is. You should scan with a narrow sonar beam to get the clearest reading, and to ensure you see any shelfs or humps which wider beam scanning might not pick up (our page onhow sonars workexplains why this is).
Hand nets are held open by a hoop, and maybe on the end of a long stiff handle. They have been known since antiquity and may be used for sweeping up fish near the water surface like muskellunge and northern pike. When such a net is used by an angler to help land a fish it is known as a landing net.[12] In the UK, hand-netting is the only legal way of catching glass eels[13] and has been practised for thousands of years on the River Parrett and River Severn.

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.


Ultrasound frequency used by a fish finder generally ranges from 15 kHz to 200 kHz. However, the majority of the conventional fish finders oriented for recreational craft utilize 50 kHz and 200 kHz. Such fish finders available in the market incorporate electronic circuitry that can transmit and receive ultrasound in these two frequencies. Also, a transducer mounted on the bottom of the craft is configured to handle these two frequencies.
The best rated fish finder, Lowrance Elite-7X, features one of the biggest screens among the models that have made it to our list of 12 top fish finders. The 7 inch widescreen offers excellent brightness, contrast and resolution. This allows viewing details even in bright sunlight and at a wider angle. The screen and keypad have an adjustable backlight for better viewing and usability at night and daylight.
Setting your tip-up baits at the proper depth requires a little work. Then every time you catch a fish or check your bait, you need to reset them. If you’ve got a few nickel-size buttons, those resets become no chore at all. Start by running your main line through one hole in the button and out another. This should allow you to move the button up and down the line easily, but provide enough tension to stop it from sliding on its own. Next, attach your egg sinker, barrel swivel, leader, and hook to the line. Once your depth is set, simply slide the button down to the water’s surface, and then reel the button up to the tip-up’s line guide. Now every time you reset your line after catching a fish or changing bait, wind the spool until the button is at the tip-up guide. Your bait will be set in the same place within the water column every time.

It is without a doubt that Lowrance has once again raised the bar for current technology. With their newly refined interface, their loyal customers will find the flow of operation to be much smoother than ever before. Don’t let the simple user operation fool you; Lowrance has built a technologically advanced unit with all the features you would expect.


Search our Knowledge Base for frequently asked questions, register your product warranty, download a product manual, or share your feature suggestions with us. If you can not find what you are looking for in the Knowledge Base, create your own topic, or email us and we will create a priority service ticket for you. Need instant help, try the chat button or the vertical tab on the right side of the screen on any page. Register your HawkEye Warranty


The CHIRP sonar that is built into this model is second to none in terms of performance, and always gives you a clear picture and measurement of the floor and surface beneath your boat, as well as the location of the fish around it. Another feature that we really enjoy about this Humingbird fish finder is that it comes with a built in SD card slot so that you can save your favorite waypoints to it. You can even upload additional maps to your software using the SD card feature.

To get the most of the both there’s the dual beam type of transducers. It’s also called dual frequency and which combines both features in one unit. Other types of transducers are more specialized. They include multiple beams (can be 4 or more). These cover a larger area of the underwater and can even give a 3D image on the display. One more option is the side beam transducer. These units shoot their signals to the sides, which increases the search area for fish.

How to choose a fish finder? There are so many fish finder brands and models of fish locators available that it can be quite difficult to figure out which one would best meet your needs and your individual fishing style. Moreover, it’s also easy to get lost in transducers, echoes, sonar, flashers and transom mounts. The most important thing to keep in mind when choosing a good fish finder is the question: will it help you to catch more fish? To make this choosing process less complicated and so you can understand more about fish detector features we have compiled this buying guide. Using this information will help you to make the best choice.

There is not much that is more relaxing than spending a beautiful day out fishing in your boat. One thing that may make the day even better is a fish finder GPS, so you do not go home without some delicious fish for dinner. On eBay, reliable sellers offer a broad range of new and used fish finders for you to choose from, including brands like Garmin, Lowrance, Eagle, and Hummingbird. With your new color GPS fish finder, you can enjoy a full color display, along with features that may include screenshots, fish and depth alarms, zoom, and dual imaging. The Garmin 546S Marine GPS find finder, for example, features a chart plotter, sonar, an anchor alarm, sunrise and sunset calculator, and marine cartography software included. No matter which fish finder GPS you decide upon, feel confident that you are receiving high-quality products and convenient shipping options that will ensure that your order makes it to you quickly.
The image to the right shows a school of white bass aggressively feeding on a school of threadfin shad. Note the school of baitfish near the bottom. When threatened, baitfish form a tightly packed school, as the individuals seek safety in the center of the school. This typically looks like an irregularly shaped ball or thumbprint on the fishfinder screen. When no predators are nearby, a school of baitfish frequently appears as a thin horizontal line across the screen, at the depth where the temperature and oxygen levels are optimal. The nearly-vertical lines near the right edge of the screen show the path of fishing lures falling to the bottom.

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GARMIN ECHOMAP 73SV FISH FINDER LIKE NEW CONDITION. Condition is Used. comes with everything in the box as new except the mounting screws for transducer, I only used this for about 1 year, then went to a garmin echo plus chirp unit, everything works like new , has original box, I know the transducer alone will sell for $200-249 alone when new any questions feel free to email me!
If I'm scouting a new area I won't know anything about what sort of structure is ahead until I paddle over it, blowing out any fish that may have been there. With this little guy, I could cast it to the spot, get a read on what's below and proceed. And, you have the luxury of retrieving it slowly to see bottom contours between you and that fishy spot. There have been a number of occasions when I've made numerous casts at a fishy looking location (without any luck), only to paddle over there and discover that it was 10" deep, nobody home.
These sonar reflections will also display on the screen. So this way a fishfinder reads and lets you view the bottom and everything it encounters in between. The angle of the sonar beam is measured in degrees and it’s called the cone angle. A wider angle covers more area underwater. Different fish detector models come with different cone angles. Some models also include multi-beam sonar technology that allows covering a much wider area.
Setting your tip-up baits at the proper depth requires a little work. Then every time you catch a fish or check your bait, you need to reset them. If you’ve got a few nickel-size buttons, those resets become no chore at all. Start by running your main line through one hole in the button and out another. This should allow you to move the button up and down the line easily, but provide enough tension to stop it from sliding on its own. Next, attach your egg sinker, barrel swivel, leader, and hook to the line. Once your depth is set, simply slide the button down to the water’s surface, and then reel the button up to the tip-up’s line guide. Now every time you reset your line after catching a fish or changing bait, wind the spool until the button is at the tip-up guide. Your bait will be set in the same place within the water column every time.
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