Garmin GPSMAP 178 Owner's Manual

Also see for GPSMAP 178 Sounder: Specifications

Contents

Garmin GPSMAP 178 Owner's Manual Manual pdf 46 page image

Sonar Page OptionsReferenceNoise Reject— helps filter unwanted noise from the graph. The ‘Noise Reject’ tool can be turned‘Off’, set to ‘Normal’ (automatically adjusts for optimum viewing), or to a fixed 1-100% setting.Increasing the Noise Reject setting decreases the sonars sensitivity. At high Noise Reject settings theunit may not show all fish or structure. To turn the Noise Reject Off, press the ARROW KEYPADDOWN until the setting bar is all the way at the bottom of the range and reads “Off”.Scroll— adjusts the rate that the graph scrolls from right to left. If you are sitting still or the graph ismoving too fast, slowing the scroll rate, or pausing it can be beneficial.Sonar Page OptionsThe GPSMAP 178/178C Sounder’s Sonar Page features a menu page that provides access to addi-tional functions and to layout and data field options.To display the Sonar Page options:1. Press MENU.To select a menu option:1. Use the ARROW KEYPAD to highlight the desired option and press ENTER.The following options are available:• Adjustments — lists the Adjustment Menu options and their current settings (see page 15).To change an Adjustment setting:1. On the Adjustment options list, use the ARROW KEYPAD to highlight the desired option and pressENTER.2. Use the ARROW KEYPAD to make the desired change and press ENTER.• Show/Hide Pointer — allows you to reference sonar items and mark underwater waypoints. Thismakes it easier to find and use an object such as a stump for a future fishing location. When usingthis feature, the Sonar Page pauses. The pointer does not move off the paused display and cannotshow an area that has scrolled off the screen. The depth is updated while the display is paused, butthe unit does not show any new sonar data until the standard Sonar Page is resumed. You may seea discontinuity from where the sonar information stops to where it starts again.Depth LineAdjustmentNoise RejectAdjustment ScrollAdjustmentSonar Page Menu Options