Plotters from Garmin (top left), Furuno (top right) and Raymarine (bottom) are shown side-by-side with their conversion kits.

There's a new breed of depthsounder that will allow your existing chartplotter or radar display to multi-task. The new technology allows those with limited electronics installation space to add a full-featured sounder/fishfinder to their navigational system without adding another electronics display. It's one of the hot new gadgets in the marine electronics market. Three of the major manufacturers already offer them—Garmin, Furuno and Raymarine—and just prior to press time we have word that JRC is joining the fray.

What We Tested…