Garmin GPSMAP 188 Owner's Manual And Reference Manual

Also see for GPSMAP 188 Sounder: Declaration of conformity Declaration of conformity Owner's manual Specifications

Contents

Garmin GPSMAP 188 Owner's Manual And Reference Manual Manual pdf 45 page image

35Sonar Page:Adjustment MenuReferenceOnce activated, the zoomed picture becomes the Sonar Page display. You may also cycle throughthe sonar zoom display levels by pressing the IN or OUT keys. The Zoom function can be deactivatedby pressing the OUT key until the ‘No Zoom’ setting appears.View/Span— available when a Zoom scale other than ‘No Zoom’ is selected. The ‘View’ or ‘Span’setting is used to change the viewing range of a zoomed display. If the Zoom is set to 2X split or 4Xsplit, only the zoomed portion on the left side of the screen is affected by the change. If the Zoomis set to Bottom Split or Bottom Lock, ‘Span’ adjusts how far off the bottom the unit displays data.In Zoom mode, you can control the view of the left side of the split.Gain— allows you to control the sensitivity of the unit’s receiver. This provides some flexibility inwhat is seen on the display. To see more detail, increase the receiver sensitivity by selecting a highergain percentage. If there is too much detail or if the screen is cluttered, lowering the sensitivity mayincrease the clarity of the display.Target Level— adjusts how dark/light a return (or target) is displayed on the screen. A Color Bar(see also page 39) appears on the right side of the screen as you adjust this setting. The higher thepercentage, the darker the return appears. This setting does not increase/decrease the unit Gain.Whiteline— controls how the unit displays information about the bottom type (hard or soft).With the Whiteline ‘Off’, the bottom return displayss as red and contains no information onbottom hardness. With Whiteline set at ‘Normal’ or 1-100%, the bottom return becomes whitewith a red line indicating where the water meets the bottom. To turn the Whiteline Off, press theARROW KEYPAD DOWN until the setting bar is all the way at the bottom of the range and reads“Off”. See page 114 for more detail on this feature.Frequency— allows you to choose a transducer frequency. Frequency refers to the “pitch” ofthe sound that the transducer sends and receives. You may choose ‘200kHz’, ‘50kHz’ or ‘Dual’frequency.View Adjustment Gain AdjustmentTarget Level Adjustment Whiteline AdjustmentFrequency Adjustment