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Fishing Boat Accessories: Fish Finders
Fish finders Help You Find the Fish
Fish finders, also called fishing sonars or echo sounders, display a representation of what is under your boat--the bottom, vegetation, structures, and fish. Systems come in single and double frequency models, but single frequency is adequate for most lakes and shallow coastal fishing.
Fish finders use a submerged transducer, mounted on the transom, inside the hull, or on the trolling motor, to send and receive underwater high-frequency sound waves. A cable connects the transducer to the fish finder. The unit’s specialized software figures out the distance to detected objects, and a graphic display uses shades of gray, symbols, or bright colors to represent structures, the bottom, different temperature layers, schools of fish, and even individuals.
Fish finders present their results on liquid crystal display (LCD) screen. LCD displays are measured in pixels - the little square blocks on the screen that make up the image. More pixels provide better resolution and a clearer picture. There are three main types of fish finder displays:
Passive Matrix monochrome and color LCDs
Active Matrix TFT (thin film transistor) color LCDs
Each type has advantages and disadvantages; be certain to try them all before selecting.
Good fish finders locate thermoclines, layers or abrupt changes in water temperature, and can help you catch fish. The contact between radically different temperatures causes some of the sonar signal to reflect back, creating a line across the LCD screen that indicates the thermocline, and potentially, fish.
Newer fish finders offer split and full screen zoom, real time imaging, adjustable backgrounds, and a choice of color palettes to highlight bottom structure or a particular fish species. Even newer fishfinders use a new transducer technology called "chirp" that modifies the transducer's pulse, which in turn allows for improved separation and detail of what is below your boat..