Garmin GPSMAP 178C Owner's Manual

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Garmin GPSMAP 178C Owner's Manual Manual pdf 43 page image

33ReferenceSonar PageSonar PageThe Sonar Page is where your GPSMAP 178C Sounder becomes a powerful fishfinder. Fish aredisplayed as colored arches or as fish icons in three different sizes. Thermoclines are shown as shadesof blue. The sonar display may also be set to show a split screen view of a zoomed portion of the sonar,bottom lock (display scaled from the bottom up), or a combination of these options (see pg. 34). Forexample, you may choose to show dual frequency at a 2X zoom (Dual 2X) on one half and normalrange dual frequency (Dual) returns on the other half. The current display mode is displayed at thebottom of each sonar display. For more information on understanding sonar and the display, see page14 and Appendix G.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 automatically times out 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%). (continued)Sonar PagePress MENU and highlight ‘Adjust-ments’ to see a list of all options andtheir current settings.The Sonar PaThe top left of thfi elds allows direcPage. The middlebeneath your boaright side of the sthe screen is an athe unit does notappears across thright side.The sonar disof the sonar, bottoptions (see pg. 3(Dual 2X) on oneThe current displSonar returnsgreens (weaker) ato view the actuaappear as green. Wof the fish symbobeam (200kHz) a(50kHz) are holloActual fish returntion, and/or other