Garmin GPSMAP 4012 Owner's Manual - Page 50

Using Sonar Understanding the Split Frequency Screen Use the Split Frequency screen (dual-frequency transducer only) to view both the 50 kHz and 200 kHz frequencies on the same screen. A 200 kHz frequency graph appears on the left; a 50 kHz frequency graph appears on the right. From the Home screen, select Sonar > Split Frequency. Depth, temperature, and water speed GPS speed and GPS heading Range Transducer frequencies Understanding the Temp Log If you are using a temperature-capable transducer, the Temp Log screen keeps a graphic log of temperature readings over time. The current temperature and depth are shown in the upper-left corner. From the Home screen, select Sonar > Temp Log. Temperature and depth Time elapsed Temperature Range The temperature appears along the right side and the time elapsed appears along the bottom. The graph scrolls to the left as information is received. Using Sonar 46 GPSMAP® 4000/5000 Series Owner's Manual