Fish finder

By | December 2, 2017

A fishfinder or sounder is an instrumentused to locate fish underwater by detecting reflected pulses of soundenergy, as in sonar.

A modern fishfinder displays measurements of reflected soundon a graphical display, allowing an operator to interpret information tolocate schools of fish, underwater debris, and the bottom of body of water.

Fishfinder instruments are used both by sport and commercial fishermen.

Modernelectronics allows a high degree of integration between the fishfindersystem, marine radar, compass and GPS navigation systems.

Fathometer Fish finders were derived fromfathometers, active sonar instruments used for navigation and safety todetermine the depth of water.

The fathom is a unit of water depth, from which theinstrument gets its name.

The fathometer is an echo sounding system formeasurement of water depth.

A fathometer will display water depth and can make anautomatic permanent record of measurements.

Since both fathometers andfishfinders work the same way, and use similar frequencies and can detect boththe bottom and fish, the instruments have merged.

Operating theory In operation, an electrical impulse froma transmitter is converted into a sound wave by an underwater transducer, calleda hydrophone, and sent into the water.

When the wave strikes something such asa fish, it is reflected back and displays size, composition, and shape ofthe object.

The exact extent of what can be discerned depends on the frequencyand power of the pulse transmitted.

Knowing that the speed of the wave inthe water is 4921 ft/s in seawater, 4800 ft/s in freshwater, the distance to theobject that reflected the wave can be determined.

The process can be repeatedup to 40 times per second and eventually results in the bottom of the ocean beingdisplayed versus time The temperature and pressure sensitivitycapability of fish finder units allow one to identify the exact location ofthe fish in the water by the use of a temperature gauge.

Functionality presentin many modern fish finders also have track back capabilities in order tocheck the changes in movement in order to switch position and location whilstfishing.

General interpretation The image above, at right, clearly shows the bottom structure—plants, sedimentsand hard bottom are discernible on sonar plots of sufficiently high power andappropriate frequency.

Slightly more than halfway up from the bottom to theleft of the screen centre and about a third away from the left side, thisimage is also displaying a fish – a light spot just to the right of a'glare' splash from the camera's flashbulb.

The X-axis of the imagerepresents time, oldest to the left, most recent bottom on the right; thusthe fish is now well behind the transducer, and the vessel is nowpassing over a dip in the ocean floor or has just left it behind.

The resultingdistortion depends on both the speed of the vessel and how often the image isupdated by the echo sounder.

Fish symbols in the screen of thefishfinder Fishfinders usually have a "Fish Symbol"feature, which will display a FISH symbol for almost any echo not connectedto the bottom or the surface.

More specialized units use a detection of aspecial fingerprint in echosignals.

With those you can find living fish and fishthat have recently died.

With these units also in some cases fish spawn willbe shown as a large fish.

Some kinds of seafish will be not marked as fish, butyou will see an echo.

Fish arches With the Fish Symbol feature disabled, an angler can learn to distinguishbetween fish, vegetation, schools of baitfish or forage fish, debris, etc.

Fish will usually appear on the screen as an arch.

This is because the distancebetween the fish and the transducer changes as the boat passes over thefish.

When the fish enters the leading edge of the sonar beam, a display pixelis turned on.

As the fish swims toward the centre of the beam, the distance tothe fish decreases, turning on pixels at shallower depths.

When the fish swimsdirectly under the transducer, it is closer to the boat so the strongersignal shows a thicker line.

As the fish swims away from the transducer, thedistance increases, which shows as progressively deeper pixels.

The image to the right shows a school of white bass aggressively feeding on aschool of threadfin shad.

Note the school of baitfish near the bottom.

Whenthreatened, baitfish form a tightly packed school, as the individuals seeksafety in the center of the school.

This typically looks like an irregularlyshaped ball or thumbprint on the fishfinder screen.

When no predators arenearby, a school of baitfish frequently appears as a thin horizontal line acrossthe screen, at the depth where the temperature and oxygen levels areoptimal.

The nearly-vertical lines near the right edge of the screen show thepath of fishing lures falling to the bottom.

General history in sporting and fishing Early sporting fathometers forrecreational boating used a rotating light at the edge of a circle whichflashed in sync with the received echo, which in turn corresponded to depth.

These also gave a small flickering flash for echos off of fish.

Like today'slow-end digital fathometers, they kept no record of the depth over time andprovided no information about bottom structure.

They had poor accuracy,especially in rough water, and were hard to read in bright light.

Despite thelimitations, they were still usable for rough estimates of depth, such as forverifying that the boat had not drifted into an unsafe area.

Eventually, CRTs were married with a fathometer for commercial fishing andthe fishfinder was born.

With the advent of large LCD arrays, the high powerrequirements of a CRT gave way to the LCD in the early 1990s and fishfindingfathometers reached the sporting markets.

Today, sporting fishfinderslack only the permanent record of the big ship navigational fathometer, andthat is available in high end units that can use the ubiquitous computer to storethat record as well.

Commercial and naval units Commercial and naval fathometers of yesteryear used a strip chart recorderwhere an advancing roll of paper was marked by a stylus to make a permanentcopy of the depth, usually with some means of also recording time so that thestrip charts could be readily compared to navigation charts and maneuveringlogs.

Much of the world's ocean depths have been mapped using such recordingstrips.

Fathometers of this type usually offered multiple speed settings, andsometimes, multiple frequencies as well.

At high frequency settings, high chartspeeds, such fathometers give a picture of the bottom and any intervening largeor schooling fish that can be related to position.

Fathometers of the constantrecording type are still mandated for all large vessels in restricted watersof land).

See also Bathymetry Echo soundingFessenden oscillator Game Boy Pocket SonarSensor SonarSounding line Notes References Fish-finder.

In Encyclopædia Britannica.

Retrieved October 1, 2008, from Encyclopædia Britannica OnlineMarine Electronics Reviews External links Post-war economics: Fisherman who caught multibillion-dollar deal FinancialTimes, 9 December 2009.

Fish Finder Information The anatomy of afish finder, technological advances, side imaging versus down imaging.

Realed to Fish Finder US Review


Garmin Striker 4 Bbuilt-in GPS Fish Finder

Garmin Striker 4 Bbuilt-in GPS Fish Finder fish finder

This Garmin Striker 4 Bbuilt-in GPS Fish Finder from: Garmin, Their ASIN : B017NI17HQ Listed with price at $119.99, Now visitor can buy this product at $102.50, Following in the success of the STRIKER fishfinder series, Garmin is proud to announce the new STRIKER fishfinders with ClearVü technology. These devices are designed to allow you to mark your favorite fishing spot and easily navigate back to it tomorrow, saving you time and money. STRIKER series fishfinders are available in 3.5-, 5- and 7-inch display sizes. fish finder .

Garmin Striker 4 Bbuilt-in GPS Fish Finder fish finder Features

  • CLEARVÜ SCANNING SONAR - Shows you more of what is in the water around your boat. This high-frequency sonar gives near-photographic images with detailed representations of objects, structure and fish.
  • THE POWER OF SIMPLE - Offers a keyed interface with dedicated buttons. The device is easy to use and easy to install. Available in 3.5-, 5- and 7-inch display sizes.
  • WAYPOINT MAP - Use the waypoint map to easily

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iBobber Wireless Bluetooth Smart Fish Finder for iOS and Android devices.

iBobber Wireless Bluetooth Smart Fish Finder for iOS fish finder

This iBobber Wireless Bluetooth Smart Fish Finder for iOS and Android devices. from: ReelSonar, Their ASIN : B00LEA2FS0 Listed with price at $99.99, Now visitor can buy this product at $89.99,

iBobber: Love at First Cast.

This pocket-sized fish finder is as mobile as you are! The iBobber is the smallest and lightest personal sonar depth finder on the market. It is a castable, portable, and wireless fish finder that syncs with the free app on your smartphone or tablet up to 100’ away. This thing is really cool!

Engineered with patented sonar technology providing accurate readings of bottom contours, fish finder .

iBobber Wireless Bluetooth Smart Fish Finder for iOS and Androi fish finder Features

  • • Patented sonar fish identifier technology
  • • LED beacon
  • • Rechargeable battery and charge status indicator light
  • • 10+ hrs battery life
  • • Accurate sonar readings down to a depth of 135'
  • • 2 Snap swivel connections for use as bobber or as remote fish finder
  • • Free app on iOS and Android
  • • Bluetooth Smart sync up to a distance of 100' for best battery life

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Venterior Portable Fish Finder, Fishfinder with Wired Sonar Sensor Transducer and LCD Display

Venterior Portable Fish Finder, Fishfinder with Wired fish finder

This Venterior Portable Fish Finder, Fishfinder with Wired Sonar Sensor Transducer and LCD Display from: Venterior, Their ASIN : B013DZJDWE Listed with price at $85.99, Now visitor can buy this product at $39.99,

Specification :
1. Measure Units: Meters / Feet
2. Display: TN/Anti-UV LCD display
3. Backlighting: Green LED
4. 4.6cm diameter Round transducer sensor
5. Depth Range : Max: 100m (328ft) ; Min: 0.9m (3ft)
6. Sensor Beam Angle: 45 degrees
7. Operating Temperature is from -20°C to 70°C (-4°F to 158°F)
8. Uses 4 x AAA batteries (not included)

Package Included :
1. Fish Finde fish finder .

Venterior Portable Fish Finder, Fishfinder with Wired Sonar Sen fish finder Features

  • Detect and display water depth, approximate fish location, short & tall weeds, sand & rocks on seabed.
  • Apply to lake, river, sea and other fishing environment. Depth range from 3ft to 328ft.
  • Round transducer with 25 ft cable and removable transducer float. Can be used for fishing off the dock, on a boat, and ice fishing.
  • Various features settings: 5 user selectable sensitivity; battery save mode; backli

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Humminbird 410210-1 HELIX 5 CHIRP GPS G2 Fish finder

Humminbird 410210-1 HELIX 5 CHIRP GPS G2 Fish finder fish finder

This Humminbird 410210-1 HELIX 5 CHIRP GPS G2 Fish finder from: Humminbird, Their ASIN : B01M2VLBQF Listed with price at $299.99, Now visitor can buy this product at $282.79, At Hummingbird, innovation is the core of everything we do. The new HELIX Series is no exception-delivering our full array of technologies, including the intuitive REFLEX interface, precise Broadband CHIRP, incredible Imaging SONAR and the mapmaking power of Auto Chart Live. Fueled by DNA that is unmistakably Hummingbird, the HELIX Series also features a jaw-dropping industrial design. From top to bottom, it's plain to see that findin fish finder .

Humminbird 410210-1 HELIX 5 CHIRP GPS G2 Fish finder fish finder Features

  • 5-Inch Color WVGA Display
  • CHIRP Dual Beam PLUS Sonar
  • Precision Internal GPS Chart plotting with built-in Anima cartography
  • Micro SD card slot for optional maps or for saving waypoints

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Deeper Smart Sonar PRO+ - GPS Portable Wireless Wi-Fi Fish Finder for Shore and Ice Fishing

Deeper Smart Sonar PRO+ - GPS Portable Wireless Wi-Fi fish finder

This Deeper Smart Sonar PRO+ - GPS Portable Wireless Wi-Fi Fish Finder for Shore and Ice Fishing from: Deeper, Their ASIN : B01CQLVO5U Listed with price at $218.98, Now visitor can buy this product at $205.00, Deeper Smart sonar Pro+ is a wireless, cast able echo-sounder compatible with iOS and Android smartphones and tablets. Wi-Fi connection Enabled to maximize both the distance between the Deeper Smart sonar Pro+ and the device holder up to 330ft/100 M and the Depth range up to 260ft/80 M. Advanced high-frequency technology enables the Deeper Smart sonar Pro+ to quickly transfer more accurate data. The higher scanning frequency allows th fish finder .

Deeper Smart Sonar PRO+ - GPS Portable Wireless Wi-Fi Fish Find fish finder Features

  • Wi-Fi connected wireless, castable, portable smart fishfinder; NO Internet or Cellular data required! Compatible with iOS and Android
  • Perfect tool for all styles of fishing: shore-, ice-, bank-, boat-, kayak-, river-, float tube fishing; operating on Fresh water and Salt water
  • The only portable sonar on the market with GPS enabled onshore bathymetric mapping feature! Create your map and analyze it on your PC vi

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Lucky Portable Fishing Sonar, Wired Fish Finder Fishfinder Alarm Sensor Transducer with Colored LCD Dispaly

Lucky Portable Fishing Sonar, Wired Fish Finder Fishf fish finder

This Lucky Portable Fishing Sonar, Wired Fish Finder Fishfinder Alarm Sensor Transducer with Colored LCD Dispaly from: Lucky, Their ASIN : B06XF17CWV Listed with price at $59.99, Now visitor can buy this product at $38.99, Specification :
1. Measure Units: Meters / Feet
2. Display: 2inch TN/ANTI-UV LCD
3. Backlighting: Green LED
4. 4.6cm diameter Round transducer sensor
5. Depth Range : Max: 100m (328.08ft) ; Min: 0.7m (2.30 ft)
6. Sensor Beam Angle: 45 degrees
7. Display the nature or circumstance of bottom of Sea (i.e. grass, rock and sand)
8. Operating Temperature is from-14°F to 122°F(-10°C-50°C)
9. fish finder .

Lucky Portable Fishing Sonar, Wired Fish Finder Fishfinder Alar fish finder Features

  • ◆Fish and bottom contour readout: It detects and displays water depth, approximate fish location, short & tall weeds, sand & rocks on bottom.
  • ◆The device suits for variety fishing environments: It can be used for boat fishing, ice fishing, lake fishing, sea fishing and so on.
  • ◆Depth readout: The transducer is with 25 ft cable and removable transducer float. Depth range from 3ft to 328ft.The depth can be s

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Deeper Smart Fishfinder 3.0 - iOS and Android Compatible Bluetooth Fish Finder for Shore and Ice Fishing

Deeper Smart Fishfinder 3.0 - iOS and Android Compati fish finder

This Deeper Smart Fishfinder 3.0 - iOS and Android Compatible Bluetooth Fish Finder for Shore and Ice Fishing from: Deeper, Their ASIN : B00SXZMQTM Listed with price at $191.99, Now visitor can buy this product at $191.99, Deeper - Smart Fish finder Deeper is a first of it's kind wireless fish finder that works in conjunction with your Android or iOS device. Information from the floating Deeper is transmitted with wireless Bluetooth technology negating the need for a cabled connection. Because of compact design, it is suitable for use on a variety of vessels, platforms or fishing grounds. fish finder .

Deeper Smart Fishfinder 3.0 - iOS and Android Compatible Blueto fish finder Features

  • Bluetooth connected wireless, castable, portable smart fishfinder; compatible with iOS and Android devices (smartphones and tablets).
  • Perfect tool for all styles of fishing: shore-fishing, ice-fishing, bank-fishing, boat-fishing, kayak-fishing, river-fishing, float tube fishing.
  • Mark anything up to 3in sized bodies in a water up to depth of 130ft, with adjustable sensitivity; Connection range up to 130ft in cle

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Lowrance 000-12635-001 Hook-3X Sonar, W/ 83/200 XDCR

Lowrance 000-12635-001 Hook-3X Sonar, W/ 83/200 XDCR fish finder

This Lowrance 000-12635-001 Hook-3X Sonar, W/ 83/200 XDCR from: Lowrance, Their ASIN : B016QVXTNQ Listed with price at $103.99, Now visitor can buy this product at $100.56, Led-backlit 3 inch color display with detailed 320 x 240 resolution that's easy to see in full sunlight & from wide viewing angles; Broadband sounder detail easily identifies fish targets, bottom contour, structure detail, bottom hardness, thermoclines & more; advanced signal processing (ASP) reduces the need to manually adjust settings to see fish, structure & bottom detail more clearly; dual-frequency 83 or 200kHz operation helps ma fish finder .

Lowrance 000-12635-001 Hook-3X Sonar, W/ 83/200 XDCR fish finder Features

  • Led-backlit 3 inch color display with detailed 320 x 240 resolution that's easy to see in full sunlight & from wide viewing angles
  • Broadband sounder detail easily identifies fish targets, bottom contour, structure detail, bottom hardness, thermoclines & more
  • Advanced signal processing (asp) reduces the need to manually adjust settings to see fish, structure & bottom detail more clearly
  • Dual-frequency 83

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iBobber Wireless Bluetooth Smart Fish Finder for iOS and Android devices & JOTO Universal Waterproof CellPhone Case (Bundle)

iBobber Wireless Bluetooth Smart Fish Finder for iOS fish finder

This iBobber Wireless Bluetooth Smart Fish Finder for iOS and Android devices & JOTO Universal Waterproof CellPhone Case (Bundle) from: iBobber Bundle, Their ASIN : B01N52WKKO Listed with price at $99.99, Now visitor can buy this product at $99.99, iBobber Wireless Bluetooth Smart Fish Finder for iOS and Android devices & JOTO Universal Waterproof Case Bundle - This pocket-sized fish finder is as mobile as you are! The iBobber is the smallest and lightest personal sonar depth finder on the market. It is a castable, portable, and wireless fish finder that syncs with the free app on your smartphone or tablet up to 100' away. This thing is really cool! Engineered with patented sona fish finder .

iBobber Wireless Bluetooth Smart Fish Finder for iOS and Androi fish finder Features

  • iBobber Wireless Bluetooth Smart Fish Finder for iOS and Android devices & JOTO Universal Waterproof CellPhone Case (Bundle) Includes:
  • 1 x iBobber Wireless Bluetooth Smart Fish Finder for iOS and Android devices.
  • Patented sonar fish identifier technology - LED beacon - Rechargeable battery and charge status indicator light - 10+ hrs battery life - Accurate sonar readings down to a depth of 135' - 2 Snap swivel

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Deeper Smart Sonar PRO+ - GPS Portable Wireless Wi-Fi Fish Finder for Shore and Ice Fishing

Deeper Smart Sonar PRO+ - GPS Portable Wireless Wi-Fi fish finder

This Deeper Smart Sonar PRO+ - GPS Portable Wireless Wi-Fi Fish Finder for Shore and Ice Fishing from: Deeper, Their ASIN : B075QDD6G3 Listed with price at $239.99, Now visitor can buy this product at $239.99, Give your favorite angler (or yourself) MORE this holiday season with Deeper’s best ever deal – the top-of-the-range Deeper PRO+ with a FREE, high-quality PETZL Tikka headlamp worth $30. The ideal combination to see more and catch more. The Deeper PRO+ is simply the highest-spec, most advanced castable wireless fish finder ever. It uses a Wi-Fi connection to sync with your phone, then cast it out to get incredible data on fish loc fish finder .

Deeper Smart Sonar PRO+ - GPS Portable Wireless Wi-Fi Fish Find fish finder Features

  • Perfect GIFT for any angler! Our best ever PRO+ offer - get the No.1 castable fish finder plus FREE high-quality PETZL headlamp worth $30.
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  • The PRO+ is THE perfect fishing gadget. Wi-Fi connected fish finder; NO internet or cell data needed, works with iOS and An

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