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All combination sounders have the ability to measure water temperature. This is useful information to determine if you are riding in a channel in open water. For large pelagic species, such as marlin and tunafish, fisherman often use small temperature fluctuations to identify pockets of water.
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There are many reasons to use a GPS combo for your fishfinder. They can be used to navigate unfamiliar fishing spots. They are great at telling you whether you're fishing in shallow water or deeper water, as well as brush and clarity of the water. Aside from making fishing more fun, you can set waypoints to help guide your boat and make maps. This is what the best combo of fish finder GPS units can do.
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The chartplotter/fishfinder combination unit offers powerboaters and sailors many advantages over purchasing separate chartplotters and sounders for their marine electronics needs. The first is that you will save money by purchasing a combination. Your life will also be much easier when you install and wire up the display.
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Many newer chartplotter fishfinders are capable of displaying AIS targets when connected with a receiver. These data are generally transmitted using an NMEA 0183 HS network. This network is 38400 baud and is not compatible with the slower 4800 baud NMEA 0283 system.
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In the years that have passed since my first fishfinder, fishing technology has evolved a lot. I still recall seeing the icons of fish on the viewing screen. I remember being a kid and thinking that there was a large fish right under the boat. Although it didn't help me very much, the sonar and depth imagery technology have improved so much that a fish finder can be a great tool to improve your skills. Additionally, we now have great access to geolocation technology (GPS), which is available at very affordable prices. To create a comprehensive picture of your fishing grounds, combine underwater imagery data with location data to create combo units.
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Newer chartplotter units that fishfinder units use can display AIS targets if connected to a receiver. These information are usually passed back and forth via an NMEA-0183HS network. This network, which is 38400baud in size, is not compatible to the slower 4800baud NMEA 0183.
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The display screen is what matters most when choosing a chartplotter/fishfinder combination. We always choose the highest resolution display screen we can afford. Some of the newer 5-inch screens we tested had resolutions in excess 150 pixels per run inch. Although a screen of this size will display stunning detail, it should be viewed from close by.