Since Global Positioning System technology became public some years back, many new generations of devices including GPS Fish Finder and other marine navigation devices have drastically improved as computer technology has become increasingly smaller. A GPS fish finder is essentially a combination of GPS and another technology such as a depth finder or sonar that both track your position on a map and reference marine life below.
Marine chartplotters you can set markers to allow you later reference one of your favorite fishing spots. This is achieved by superimposing an image onto your GPS map and storing its location by using a user defined name for the location. Many fishermen name their markers by species and or geography.
Fish finders consist of the transducer which emits and receives signal, the display which can be backlit and come in color and the mounting hardware. Several options for transducers include mounting features whereas the owner can either hard mount the unit to the boat or use suction cups to temporarily mount the unit as necessary. Swivel mounting and quick disconnect options enable you the most flexible installation and assurance that your unit wont be stolen by allowing you to quickly remove the unit when you leave your boat. Although most transducers need to installed through a hole in the bottom of the boat hull, some models can be hand held and operate using transducer floats.
Information about the depth, fish numbers, speed and the water temperature are reported back to the display monitor. Many units also have multiple beam options that allow you to reference side imaging for a substantial cost.
Many different display options make your fish finder more useful depending upon budget. Displays range from 5 to 10 inches and the quality of resolution also varies by manufacturer and model. One consideration you should have is the lighting you need. In sunlight, having a very bright model that is visible in all lighting conditions is important. Some models come in up to 256 color LCD models and that results in clearer images. Many models allow you to record your findings so that you can play back the findings and determine the best course of action for charting your future activity.
The feedback information that you get from your unit can range from dots to actual fish symbols and hazard mimicking. Having the ability to show depths up down to over 1000 feet and receiving imaging that depicts the structure of the floor below is highly advantageous.