You will find the Humminbird Fishfinder on many fishing boats, not only to locate fish but to detect underwater obstacles. The transducer, which is placed under the boat, sends sonar beams into the water. When those sonar beams bounce back, they are displayed on a screen allowing the captain to see what's below the boat. Keeping the fish finder functional is vital to being able to boat safely and successfully.
Switch the Humminbird Fishfinder on. If the unit does not power up, check the cable to make sure that it is properly pushed into both the display screen and the ability source. If the connection is loose, the unit could malfunction. Check to verify the cable is in good condition. If the cable is damaged, replace it.
Check the fuse box to make sure that none of the fuses have blown. Replace any as necessary.
Check the display screen for white noise. If you find that it has some, there is a problem with the transducer. Locate the transducer on the underside of the boat and check that it is not too close to the propellers. This placement causes the white noise and the transducer needs to be moved. Unscrew the transducer mounts and relocate nearer to the centre of the boat's hull. Check the cables connecting the transducer for signs of wear and replace if necessary.
Spray the buttons on the display screen with the compressed air and wipe clean with the chamois leather. The buttons can become sticky over time, causing them to become unresponsive.