The fish finder sends out ultrasonic waves that travel right under the boat. If they hit a school of fish, very weak echoes will go back to where the ultrasonic waves were sent.
The reflected sound is turned into an electrical signal, which is then sent to the fish finder's receiving circuit. The receiving circuit boosts the weak signals, and the processor unit uses those signals to make images that are shown on the screen.
Because of this, the image will show up on the color LCD. On the screen, reflections that are stronger are shown in orange or red, and reflections that are weaker are shown in green or blue.
Large schools of fish or rocks on the seabed send back stronger signals, so they are shown in a reddish color. A small school of fish or rocks on the seabed sends back weaker signals, so they are shown in a blueish color.
The color presentation can show clearly what is going on under the sea.
A fish finder helps you find a school of fish and gives you information about the water depth, where the school is, and how the seabed is doing.
This page is continuously updated. You can also click on "refresh" to view the possibly modified page.
Humminbird APEX VX Series GPS Fish Finder with LakeMaster and CoastMaster VX Maps, MEGA Side Imaging+
$4,199.99 (as of March 13, 2026 17:52 GMT +01:00 - More infoProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)
Jiisquilyx Fish Finder & Underwater Camera: 6'' HD 1080P Waterproof Ice Fishing Camera with Monitor｜Portable Fish Finders for Ice/Lake Fishing｜Depth Finder for Boat/Kayak & Murky Under Water
$129.00 (as of March 13, 2026 17:52 GMT +01:00 - More infoProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)
SUNMORN Underwater Fishing Camera with 4.3" HD IPS Screen, 220° Wide-Angle View, 50ft Waterproof Cable & 6000mAh Battery – Ideal for Ice, Lake, Boat and Kayak Fishing
$41.99 (as of March 13, 2026 17:52 GMT +01:00 - More infoProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)
Humminbird XPLORE Series GPS Fish Finder MEGA Side Imaging+ & HD Touchscreen Display
$1,399.98 (as of March 13, 2026 17:52 GMT +01:00 - More infoProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)
Helix 9 Cover, Compatible with Humminbird Helix 8 & Helix 9, Waterproof Fish Finder Cover, Made of Neoprene Protects Your Screen and Device from Sun and Adverse Weather Damage
$14.99 (as of March 13, 2026 17:52 GMT +01:00 - More infoProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)
Garmin Striker Vivid 4cv, Easy-to-Use 4-inch Color Fishfinder and Sonar Transducer, Vivid Scanning Color Palettes - 010-02550-00
$179.99 (as of March 13, 2026 17:52 GMT +01:00 - More infoProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)
0 Degree Pole Mount Compatible with Garmin LiveScope System (LVS32), Replaces 010-12784-01
$55.99 (as of March 13, 2026 17:52 GMT +01:00 - More infoProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)
Lowrance Eagle Eye 9" Fishfinder with Live Sonar, Chirp Sonar and DownScan with Fish Reveal
$899.00 (as of March 13, 2026 17:52 GMT +01:00 - More infoProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)
Portable Transducer Mount Bracket with Fishfinder Mount, 360° Rotatable Universal Fish Finder Mount for Boat Canoe Kayak Fishing, Max Opening 3.15"
$37.99 (as of March 13, 2026 17:52 GMT +01:00 - More infoProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)
Lowrance 000-0106-72 Transom-Mount 83/200 kHz Skimmer Transducer with Built-in Temp, Black
$58.49 (as of March 13, 2026 17:52 GMT +01:00 - More infoProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)
LUCKY Kayak Portable Fish Depth Finder Water Handheld Fish Finder Sonar Castable Kayak Boat Fishfinder Transducer Fishing LCD Display FFC1108
$42.99 (as of March 13, 2026 17:52 GMT +01:00 - More infoProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)
710274-1 XNT 9 HW T Transom Mount Transducer with Temperature Sensor Fits for Humminbird Helix with Dual Spectrum Chirp 2D Sonar, 20Ft Cable Length
$86.99 (as of March 13, 2026 17:52 GMT +01:00 - More infoProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)
ECHOMAP Ultra 2 10" LiveScope Plus Bundle
$2,599.99 (as of March 13, 2026 17:52 GMT +01:00 - More infoProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)
Humminbird 411670-1 Helix 5 Chirp DI GPS G3 Fish Finder
$344.59 (as of March 13, 2026 17:52 GMT +01:00 - More infoProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)
JERBOR Upgraded ABS Plastic Transducer Mounting Plate Fit for Lowrance Active Imaging 3-in-1 Minn Kota Transducer Mount Waterproof
$32.99 (as of March 13, 2026 17:52 GMT +01:00 - More infoProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)
Lowrance Elite FS Fishfinder/Chartplotter, Available with and Without Transducer
$1,099.00 (as of March 13, 2026 17:52 GMT +01:00 - More infoProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)
Jiisquilyx IP68 Waterproof Underwater Fishing Camera with Monitor | All-in-One Portable Fish Finder with Night Vision & Depth Finder | for Ice, Lake, Sea, Kayak, Boat
$129.00 (as of March 13, 2026 17:52 GMT +01:00 - More infoProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)
Garmin Striker Cast, Castable Sonar with GPS, Pair with Mobile Device and Cast from Anywhere, Reel in to Locate and Display Fish on Smartphone or Tablet (010-02246-02)
$149.99 (as of March 13, 2026 17:52 GMT +01:00 - More infoProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)
FarmNix Underwater Fishing Camera, 7" LCD Monitor with 10000mAh, Waterproof Portable Fish Finder, Underwater Camera for Fishing & Ice Fishing, 32GB DVR, IR LED 98FT Fish Cam for Ice Lake Boat Fishing
$99.26 (as of March 13, 2026 17:52 GMT +01:00 - More infoProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)
