Garmin GPSMAP 441s Owner's Manual - Page 64
Understanding the Split Frequency Screen, Sonar, Split Frequency, Split Zoom - with dual frequency transducer
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Using Sonar Understanding the Split Frequency Screen Use the Split Frequency screen (dual-frequency transducer only) to view both the 50 kHz and the 200 kHz frequencies on the same screen. A 50 kHz frequency graph appears on the left. A 200 kHz frequency graph appears on the right. From the Home screen, select Sonar > Split Frequency. Depth, temperature, and speed 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 speed Range Frequencies Split Frequency 58 Zoomed depth scale Zoom window Range Zoom level Transducer frequency or beam width Split Zoom GPSMAP 400/500 Series Owner's Manual