Raymarine’s award winning Dragonfly plotter sounder offers dead-simple setup and operation with two controls: a rotary controller and a menu button. Designed for inshore use, there’s not a boat that doesn’t have the space to mount it. The dual-mode CHIRP sounder operates simultaneously in conventional conical beam (170-380 kHz) and Raymarine’s DownView high-res sonar imaging (320-380 kHz) for ultimate detail in bottom and structure. Plotter supports Navionics charts. $649.99 with transducer.