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finders work on the idea of Sonar. This technology was used by US, Navy seventy years ago to find submarines under the sea. Here the sound waves are emitted by the sonar devices which travel to the depth of the sea and returns back. The time taken for the sound waves to reach the bottom of the sea and return is measured by means of a stop watch. It will give the position of the submarine inside the ocean.

The same strategy is used by the fishfinder GPS System to locate the presence of fish schools in the sea or lake water. GPS is the acronym of global positioning systems. GPS is greatly used in guiding car drivers and boat captains to the right location. Fishfinder GPS devices are being produced by a very limited number of manufacturers. These are Humminbird, Eagle, Garmin, Lowrance & NorCross.
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Out of these manufacturers, Garmin and Humminbird are the leading brands with a good client base. When purchasing a fishfinder GPS combo, there are several features that a buyer should think about before choosing a correct fishfinder GPS. The usage of the fishfinder GPS isn't very complex and it can be understood by an user who can read electronic data.

The next feature one should consider is the power of the transducer that send sound waves. The greater the power of the waves, more distance the sound waves travel. The other feature that should be considered is the resolution of the display that displays the output data. It will be easily readable by the user and should not be difficult to understand.

A Humminbird Fishfinder GPS with chart plotter is available for approximately $200, whereas a Garmin fishfinder GPS with chart plotter comes for around $250. Both those fishfinders with chart plotters fall under the category of a fishfinder GPS Combo. Those GPS fishfinder combo devices are readily available on the web and in selected stores.