Garmin GPSMAP 178C Owner's Manual

Also see for GPSMAP 178C: Specifications Flush Mount Template Manual Owner's manual

Contents

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

36Sonar Page OptionsReference Depth Line— adds a horizontal depth line across the display which is used to measure the depthof underwater objects. The depth of the line appears in a box on the right side of the line. Press UPor DOWN on the ARROW KEYPAD to control the position of the line on the graph. The depth isdisplayed in a window on the right side of the line. To turn the Depth Line Off, press the ARROWKEYPAD UP until the setting bar is all the way at the top of the range and reads “Off”.Noise 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.When setting the Noise Reject tool: the HIGHER the noise rejection setting, the unit is more likelyto NOT show fish or structure. To turn the Noise Reject Off, press the ARROW KEYPAD DOWNuntil 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 graphis moving too fast, slowing the scroll rate or pausing it can be beneficial.Sonar Page OptionsThe GPSMAP 178C Sounder’s Sonar Page features a menu page that provides access to additionalfunctions 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.Depth LineAdjustmentNoise RejectAdjustment ScrollAdjustmentSonar Page Menu Options