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Most combo sounders will be able to detect water temperature. This information can be very helpful when trying to determine if youre on a current channel or not in open seas. Fishermen often use temperature variations to pinpoint areas that may hold large pelagic fish species like marlin.
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This isn't a major problem for most boaters since failure is very rare. If the boat does not work, it is still a good idea to have a plan to get to safety.
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Before purchasing any chartplotter fishfinder combination unit, you should also consider cartography. A certain brand of chart card may be available for trade or you might already have it. You will get the best sounder information and, more importantly, fishfinder data from your combo.
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GPS fishfinders are extremely important to fishing. The devices come with an embedded GPS and can be used to pinpoint your exact fishing location within seconds. Continuous inertial reference pulse (CHIRP) sonar technology lets you see the habits of fish and their feeding patterns much better than traditional GPS. Any fisherman will appreciate a GPS fish finder that can display a greater than 7 inch screen.
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When sonar finds fish, Fish ID displays the fish icon. Flasher sonar functions provide a more abstract view. This is ideal for ice fisherman. Split Zoom is a way to magnify certain parts of the sonar picture. You can use this function in conjunction with a regular viewing using the split screen capability. The Bottom Lock feature concentrates sonar pings on the bottom of the mass.
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Because you will only need to learn how to operate one unit, the learning curve for operational operations will be shorter. The downside to a combination unit is that you now have all your marine electronics in one place.
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The supplied transducer includes a transom mount as well as a builtin water temperature probe. It also comes with a 20 foot cable. The temperature graph function shows the difference in temperature between the surface temperature of the water and the currents beneath it.