How Fishfinders Work

Fishfinders are very interesting devices. They are so high tech, some fishermen don’t really know much about them. But you can easily learn. Here are some common terms about fishfinders to help you understand.

Fishfinders work by sending out a sound wave from their transducer. This sound wave goes out in a straight line (just like SONAR) and will bounce off of anything in its path. When it bounces off something, this sound wave returns to the transducer. This is known as the echo, and the smart electronic brain inside the fishfinder is able to calculate the distance of what ever for an object caused the echo.

With all this information, the fishfinder is then able to generate a display of what the sound waves “see” underneath your boat.

Obviously, we all hope that the foreign object was a fish. Despite what you may think, the entire fish is what returns this echo. High end fishfinders are capable of making an intelligent guess as to what the size, kind, and number if possible of the fish are. That is very useful!

Fishfinders are also capable of determining what the bottom is like. This is very helpful for navigation and if you know what kind of fish like to be in certain areas. For example, the clay bottom is soft and will be represented by a very thin line under fishfinder. But if you are for example fishing on a hard rocky bottom, your fishfinder will give you a thick line.

Another important measurement that fishfinders can give you are temperature differences. Different types of fish like to swim in different types of water, and different temperatures of water also helped the plankton and other fish foods grow. By a accurately figuring out the temperature of the water you’re fishing in, you can help catch more fish.