Raymarine has a few units that come with a built in GPS. The Dragonfly 4Pro, Dragonfly 5Pro, and Dragonfly 7Pro all have built in GPS. Pay close attention to the unit you are buying, because if you are looking for built in GPS the standard Dragonfly 4 and Dragonfly 5DVS do not have that feature built in. You absolutely have to go Pro to make sure you get the GPS you’re looking for.
Raymarine’s DragonFly 4 PRO with Navionics Plus Mapping offers Dual-Channel Sonar with CHIRP DownView enabling easy identification of fish and underwater structure with photo-like images. Reaching depths of 600ft with CHIRP DownVision and 900ft with CHIRP Sonar the DragonFly 4 includes a built in GPS receiver and provides accurate coastal navigation data all on a 4.3” Color Display.
Hello there! My name is Rick and you’ve probably come across my website because you’re in search of a product that will make your fishing experience easier and more effective. Or maybe you are just looking for information to get a better understanding of fish finders. In any case, you’ve come to the right place. I’m not a professional in this industry, I’m just a fishing enthusiast and during my search for the best fish finder on the market I’ve learned quite a few things about them. To give you the benefit of all the research I’ve done, I’ve created this website.
In operation, an electrical impulse from a transmitter is converted into a sound wave by an underwater transducer, called a hydrophone, and sent into the water. When the wave strikes something such as a fish, it is reflected back and displays size, composition, and shape of the object. The exact extent of what can be discerned depends on the frequency and power of the pulse transmitted. Knowing the speed of the wave in the water, the distance to the object that reflected the wave can be determined. The speed of sound through the water column depends on the temperature, salinity and pressure (depth). This is approximately c = 1404.85 + 4.618T - 0.0523T2 + 1.25S + 0.017D (where c = sound speed (m/s), T = temperature (degrees Celsius), S = salinity (per mille) and D = depth). Typical values used by commercial fish finders are 4921 ft/s (1500 m/s) in seawater and 4800 ft/s (1463 m/s) in freshwater.
ONE SMALL STEP FOR MAN, ONE GIANT LEAP FOR PADDLING_KIND: In the 2009 ICAST article, I mentioned a combo system that was in the new products exhibit, but wasn't available at the time of the show. It's most certainly available now, and that unit is the Humminbird 385CI. Like us, fish seek comfort, safety, and food. This unit will allow you to gather "data" that you can process in to fish finding "information".
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