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 43 page image

33ReferenceSonar PageSonar PageThe Sonar Page is where your GPSMAP 188/188C/238 Sounder becomes a powerful fishfinder/fl asher. Fish are displayed as colored arches or as fish icons in three different sizes. Thermoclines areshown as shades of blue. The area of strongest sonar return (or whiteline) is displayed as solid white.Typically, the bottom will be the primary whiteline. A thin whiteline indicates a soft bottom while athick whiteline will follow the contour of the bottom and show any objects of reasonable size. For moreinformation on understanding sonar and the display, see page 14 and Appendix I.Using the Adjustment MenuThe Adjustment Menu allows direct access to the settings and features most commonly used on theSonar Page. The currently selected option appears in the upper left of the display.To select an adjustment option from the Sonar Page:1. Press the ARROW KEYPAD LEFT/RIGHT to scroll through the options in the upper left of thedisplay, then press ENTER to access the desired option’s adjustment window.OR:1. Press MENU, highlight ‘Adjustments’ and press ENTER. A list of all options and their current set-tings appears, with the selected option highlighted. Press UP/DOWN on the ARROW KEYPAD toselect the desired option and press ENTER to access the adjustment window.To easily exit any of the adjustment options, press the QUIT key.To change an Adjustment Menu setting:1. Select an adjustment option to change using one of the two methods described above. The adjust-ment window will automatically timeout and disappear when idle for 20 seconds.2. Press the ARROW KEYPAD UP/DOWN to place the pointer or setting bar at the desired setting,range or percentage (Off, 1-100%).3. Press ENTER or QUIT to exit the adjustment window; or press LEFT/RIGHT on the ARROWKEYPAD to view another adjustment window.Sonar PageAdjustmentMenuPress MENU andhighlight ‘Adjustments’to see a list of all optionsand their current settings.