The temperature and pressure sensitivity capability of fish finder units allow one to identify the exact location of the fish in the water by the use of a temperature gauge.Functionality present in many modern fish finders also have track back capabilities in order to check the changes in movement in order to switch position and location whilst fishing.

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The common earthworm is a universal bait for fresh water angling. In the quest for quality worms, some fishers culture their own worm compost or practice worm charming. Grubs and maggots are also considered excellent bait when trout fishing. Grasshoppers, flies, bees and even ants are also used as bait for trout in their season, although many anglers believe that trout or salmon roe is superior to any other bait. Studies show that natural baits like croaker and shrimp are more recognized by the fish and are more readily accepted. A good bait for red drum is menhaden.[5] Because of the risk of transmitting whirling disease, trout and salmon should not be used as bait.
BUT DOES A FISHFINDER REALLY FIND FISH? Does a woodchuck really chuck wood? Sorry jackwagon, I had to go there. A fishfinder works on the same theory as deep space telescopes identifying distant stars. It doesn't see "fish" but it does see things that don't look like water. Once the data is processed, the resulting image is therefore labeled fish. Therefore, these units absolutely process the data and tell you if fish are in the beam. But alas, they don't know what they're eating, or if they're even in the mood to eat. But, I do believe that fish will almost always eat if given the right offering. But, you have to find them first.

Finally, we come to the HDS-7 from Lowrance. I have had limited experience with this company, but from what I know it is a fantastic maker of fish finders, and the HDS-7 is no exception. This particular model has a seven-inch touchscreen, which makes it one of the most high-tech options you can find anywhere. If you like a more ergonomic design and want something that is more user-friendly, the HDS-7 could be for you.

Fully Networkable, 8” Touchscreen Chartplotter and Sonar. Garmin’s GPSMAP 7608xsv includes built in maps for Coastal and Lake mapping, a 10HZ GPS Receiver providing fast acquisition and position tracking. High Performance HD-ID Sonar, 1kW CHIRP, CHIRP DownVu and CHIRP SideVu. Now enjoy FLIR Camera Compatibility, Smart Boundaries and More. Transducer Required and Sold Separately.
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.

It terms of the functionality, the HDS-7 is able to connect to the internet to broadcast data, update to new software, upload information such as marked coordinates and more. This Lowrance model uses the latest of advanced technologies such as CHIRP sonar, Broadband sounder, StructureScan HD, DownScan imaging and Trackback view for the ultimate fish finding experience.
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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.
As you look for a GPS/fishfinder combo, keep in mind that the best power and frequency won’t mean much if you can’t use the information. Think in terms of a computer. You can have the most-powerful and efficient computing capability, but without a high-quality monitor, the data does you little good. That’s why it’s always a good idea to spend a bit more to get a top-shelf screen.
Standalone fishfinder: If you just want to see what’s below, dedicated fishfinders give the biggest display and the most performance for the least cost. If you have a small boat that you use for fishing small inland lakes or are on a limited budget, a standalone fishfinder is for you. Conversely, if your pilothouse has room for multiple displays, or if you just bought a new GPS, get a serious big-screen fishfinder. You can usually add a GPS sensor later to many units, turning them into chartplotter combos.

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.
Inland fishfinding has changed, with high-frequency (455 or 800kHz) transducers that look to the side, straight down or can aim over a 360-degree range. Fishfinder manufacturers offer the inland angler a growing (and often confusing) assortment of choices in frequencies, beamwidths, even the underwater direction you can look. Inland anglers who search for fish in shallow lakes don’t need the power to see down to 5,000', but can gain a big advantage by looking out to the sides, so Garmin, Raymarine and Lowrance have products using multi-beam transducers for that purpose. Here’s where the Marketing Jargon takes over, with names like StructureScan HD™ and CHIRP DownVision.
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.