Garmin GPSMAP 820 Owner's Manual - Page 22

• If you have a 200/50 kHz, dual-frequency transducer, select Dual Frequency. • If you have another type of transducer, select it from the list. Sonar Setup Sonar Settings NOTE: Not all options and settings apply to all models, sounder modules, and transducers. From a sonar view, select MENU > Sonar Setup. Depth Line: Shows a quick-reference depth line. Scroll Speed: Sets the rate at which the sonar scrolls from right to left. In shallow water you might want to slow the scroll speed to extend the length of time the information is displayed on screen. In deeper water you might want to increase the scroll speed. On-screen Control: Sets what the buttons on the sonar screen control. This is available for touchscreen devices. Range Lines: Shows the vertical lines indicating the distance to the right and left of the boat. Available for SideVü sonar view. Color Scheme: Sets the color scheme of the sonar view. This setting might be available in the Appearance menu. The high contrast color schemes provide darker color assignments to the low intensity returns. The low contrast color schemes provide color assignments to the low intensity returns that are similar to the background color. Appearance: See Sonar Appearance Settings. Overlay Numbers: Sets the data shown on the sonar screen. Advanced: See Advanced Sonar Settings. Installation: Restores the default sonar settings. Sonar Appearance Settings NOTE: Not all options and settings apply to all models, sounder modules, and transducers. From a Sonar view, select MENU > Sonar Setup > Appearance. Color Scheme: Sets the color scheme. Edge: Highlights the strongest signal from the bottom to help define the hardness or softness of the signal. A-Scope: Displays a vertical flasher along the right side of the screen that shows instantaneously the range to targets along a scale. Pic. Advance: Allows the sonar picture to advance faster by drawing more than one column of data on the screen for each column of sounder data received. This is especially helpful when you are using the sounder in deep water, because the sonar signal takes longer to travel to the water bottom and back to the transducer. The 1/1 setting draws one column of information on the screen per sounder return. The 2/1 setting draws two columns of information on the screen per sounder return, and so on for the 4/1 and 8/1 settings. Fish Symbols: Sets how the sonar interprets suspended targets. Advanced Sonar Settings NOTE: Not all options and settings apply to all models, sounder modules, and transducers. From a sonar view, select MENU > Sonar Setup > Advanced. Interference: Adjusts the sensitivity to reduce the effects of interference from nearby sources of noise. The lowest interference setting that achieves the desired improvement should be used to remove interference from the screen. Correcting installation issues that cause noise is the best way to eliminate interference. Surface Noise: Hides surface noise to help reduce clutter. Wider beam widths (lower frequencies) can show more targets, but can generate more surface noise. Color Gain: See Adjusting the Level of Detail. TVG: Adjusts the appearance of returns to compensate for weakened sonar signals in deeper water, and reduces the appearance of noise near the surface. When the value of this setting is increased, the colors associated with low-level noise and fish targets appear more consistent through various water depths. This setting also reduces the noise near the surface of the water. Sonar Installation Settings NOTE: Not all options and settings apply to all models, sounder modules, and transducers. From a sonar view, select MENU > Sonar Setup > Installation. Restore Sonar Defaults: Restores the factory default settings for the sonar view. Transducer Type: Allows you to select the type of transducer that is connected to the device. Flip Left/Right: Changes the orientation of the SideVü sonar view when the transducer is installed backward. Sonar Alarm Settings NOTE: Some settings require external accessories. Select Settings > Alarms > Sonar. Shallow Water: Sets an alarm to sound when the depth is less than the specified value. Deep Water: Sets an alarm to sound when the depth is greater than the specified value. Water Temp. : Sets an alarm to sound when the transducer reports a temperature that is 2°F (1. 1°C) above or below the specified temperature. Fish: Sets an alarm to sound when the device detects a suspended target. • sets the alarm to sound when fish of all sizes are detected. • sets the alarm to sound only when medium or large fish are detected. • sets the alarm to sound only when large fish are detected. Sonar Recordings Recording the Sonar Display NOTE: Not all models support sonar recording. 1 Insert a memory card into the card slot. 2 From a Sonar view, select MENU > Record Sonar. Stopping the Sonar Recording Before you can stop recording the sonar, you must begin recording it (Recording the Sonar Display). From a sonar view, select MENU > Stop Recording. Deleting a Sonar Recording 1 Insert a memory card into the card slot. 2 Select Sonar > Sonar Recordings. 3 Select a recording. 4 Select Delete. 16 Sonar