Garmin GPSMAP 276C Owner's Manual - Page 100
Btm Bottom Lock, Btm Bottom Split
UPC - 753759044138
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Setting Up and Using Sonar > Using the Sonar Page • 2X Zoom-shows the 2X zoomed picture on the full screen. • 4X Split-shows two reduced pictures, the right at the original depth scale and the left at 1/4 the original depth scale. • 4X Zoom-shows the 4X zoomed picture on the full screen. • Btm (Bottom) Split-shows two reduced pictures, the right at the original depth scale and the left showing sonar returns from the bottom up. All target depths read as a distance from the bottom. • Btm (Bottom) Lock-shows returns from the bottom up on the full screen. Tip: Quickly zoom in and out of the Sonar display by pressing the In and Out keys. Turn off the zoom function by pressing the Out key until the No Zoom setting appears. View/Span-changes the viewing range of a zoomed display. If the display is 2X or 4X split, only the zoomed portion on the left side of the screen is affected by the change. If the display is Bottom Split or Bottom Lock, Span adjusts how far off the bottom the unit shows data. This option is available when a Zoom scale other than No Zoom is selected. Gain-allows you to control the sensitivity of the unit's receiver To see more detail, increase the receiver sensitivity by selecting a higher gain. If there is too much detail select a lower gain. 92 Target Level-adjusts colors used to show sonar information. A Color Bar appears on the right side of the screen as you adjust this setting. A higher percentage results in more strong-signaled colors shown on the sonar display. A lower percentage results in more weaker-signaled colors shown on the sonar display. This setting does not increase or decrease the unit Gain. Whiteline-controls how the unit shows information about the bottom type (hard or soft). With Whiteline Off, the bottom return shows as red. Set Whiteline at Normal or 1-100% to determine bottom hardness. See page 100 for more information. Frequency-allows you to choose a transducer frequency. Frequency refers to the "pitch" of the sound that the transducer sends and receives. Depth Line-adds a horizontal depth line across the display that is used to measure the depth of underwater objects. The depth of the line appears in a box on the right side of the line. Press up or down on the ROCKER to move the line on the sonar display. Noise Reject-helps filter unwanted noise from the sonar display. The Noise Reject can be turned Off, set to Normal (automatically adjusts for optimum viewing), or to a fixed 1-100% setting. When setting the Noise Reject, remember that a higher noise rejection setting is less likely to show fish or structures. GPSMAP 276C Owner's Manual