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Raymarine Dragonfly 4 and 5DV sonar units for sale I have 2 x 4DV Sonar £191.00 INC VAT I Have 1 x 5DV Sonar £284.00 INC VAT **WHILE STOCK LAST** Superior Fishing Electronics Made Incredibly Simple By RaymarineChange your underwater view and catch more fish with the Dragonfly 4 and 5 wide-spectrum CHIRP DownVision™ technology. Easily identify fish and underwater objects with photo-like sonar images. Dragonfly’s all-weather, high-definition color LCD display looks sharp from every angle. Step up to a smarter species of sonar with Dragonfly. The Dragonfly DifferenceA leap into the future of sonar, Dragonfly sonars employ true wide spectrum CHIRP technology. With wide spectrum CHIRP more sonar signals are transmitted into the water, allowing Dragonfly to interpret more detail, target more fish, and image structure with unmatched clarity. CHRIP DownVision™ - Simply The Best Imaging SonarCHIRP DownVision™ will change your underwater view with incredibly clear, photo-like sonar images. Dragonfly’s CHIRP DownVision™ surpasses ordinary imaging sonars with superior deep water performance to 600ft (180m) and reliable high speed bottom tracking. A Better ViewEach Dragonfly is engineered with optical bonding LCD display technology. Once only available on high end marine displays, Dragonfly’s all weather optically bonded displays deliver brighter colors, sharper contrast, and are guaranteed to never fog up. Connect & Share WirelesslyDragonfly PRO models feature built in Wi-Fi. Anglers can stream Dragonfly sonar data right to their smartphone or tablet with the Raymarine Wi-Fish™ mobile app. The Wi-Fish mobile app puts Dragonfly sonar vision right in the palm of your hand, plus you can rewind and capture sonar images to share online with friends. Superior SonarUnlike conventional imaging sonars that transmit at a single frequency with each pulse, Dragonfly’s DownVision™ sonar uses CHIRP technology to transmit across a wide spectrum of sonar frequencies simultaneously – the result is much higher-resolution, life-like sonar images. Dual-Channel CHIRPCHIRP Downvision™ plus a CHIRP-powered fish targeting channel for conventional sonar imagery. Dual-channel sonar is available on all Dragonfly models except the Dragonfly 4DV Mount AnywhereThe Dragonfly 4 and 5’s compact ball-and-socket mounting system makes installation simple. The mount is easy to upgrade to after market ball-and-socket mounting systems.

I've got a Airmar transducer fitted to my aging Raymarine kit (DSM 300, E120). When the boat in freshly launched the sonar will work up to just about 25knots if flat, but now, after a season in the water (10 months) it will barely work at all. The last couple of trips it has been no use at all as even on the drift the bottom comes and goes. This happened last year as well, the first year I got the boat. Clearly the transducer cover is being fouled up over time and I've no doubt that when it goes back in after relaunch it will be fine for while, I'd just like to extend that while to 10 months. Is this the problem you get? Any suggestions on keeping it free of fouling for longer? I have heard that you can buy special anti fouling paint to go over transducers, any view of whether this is worth getting? Steve