Getting started Congratulations on your purchase of a Furuno sonar. If you have used sonar before you probably already understand just how powerful a tool it can be. But like any other of your onboard tools (Radar, GPS, Fish finder, etc) initially there is a brief learning curve to go though. This booklet contains some helpful information to start you pinging. The best way to get started is right at the dock. Here you can learn how easily your sonar will display a target.