How to Use a Garmin Fish-finder

Written by kassie kleifgen
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How to Use a Garmin Fish-finder
By using a Garmin fish-finder, you can find fish quicker and easier. (fishing boat image by Pat Lalli from

A Garmin fish-finder is an automatic sonar unit that is designed to help you find fish in a body of water. The fish-finder will show you a black-and-white picture of what is directly under the sonar unit beneath your boat at that moment, including the shapes of fish, rocks, seaweed, and the depth and temperature of the water. Learning how to use the Garmin fish-finder is based on understanding the buttons on the device. The fish-finder will save time and increase your catch by quickly putting you on fish.

Skill level:

Things you need

  • Garmin fish-finder

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  1. 1

    Press and release the power key to turn on the fish-finder.

  2. 2

    Press the menu key to pull up the menu and use the arrows to move back and forth between the range, gain, scroll, zoom, set-up and view. Move the arrows left and right in range to change the maximum water depth that the fish-finder picks up. Move the arrows left and right in gain to control the sensitivity of the sonar. In scroll, set the rate at which the graph moves. When you are set on a selection, push the enter button.

  3. 3

    Press the menu button and use the arrows to select the word "setup" and press enter. Here you can set alarms to sound for a low battery, shallow water and deep water, and upon the detection of fish. Use the left and right arrows to scroll through the options and set the alarms by pressing enter.

  4. 4

    Look on the screen for the large numbers in the left-hand corner. The top number is how deep the current water is, and the bottom number is the temperature of the water.

  5. 5

    Look for fish shapes on the fish-finder's screen. Once a fish appears, that fish is below the fish-finder and your boat. The number next to each fish is the fish's depth so you can determine how far down to drop your line.

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