Garmin GPSMAP 4012 Owner's Manual - Page 49

Using Sonar Using Sonar When connected to an optional Garmin GSD 22 sounder module and a transducer, your chartplotter can be used as a fishfinder. The GSD 22 connects through the Garmin Marine Network and shares sonar data with every chartplotter connected to the network. Understanding the Full Screen Select the Full Screen option to view a full-screen graph of the sonar readings from the transducer. The range scale along the right side of the screen shows the depth of detected objects as the screen scrolls from the right to the left. From the Home screen, select Sonar > Full Screen. Depth, temperature, and water speed Suspended target Bottom Range GPS speed and GPS heading Transducer frequency Understanding the Split Zoom Screen Use the Split Zoom screen to view the full sonar data from the graph and a zoomed-in portion on the same screen. From the Home screen, select Sonar > Split Zoom. Depth, temperature, and water speed Zoomed depth scale GPS speed and GPS heading Zoom level Zoom Range window Transducer frequency Using Sonar GPSMAP® 4000/5000 Series Owner's Manual 45