Garmin gpsmap 178, 178c Manuale Utente

1.  On the adjustment window for the desired option, press MENU.
2.  Select the desired setting and press 

ENTER. 

 Range— sets the display depth range used for viewing. The unit can be set to automatically track 
the bottom or set to a user-specified depth range. Auto mode displays the most information possible 
while continuously showing the bottom.
 Zoom— used to quickly select a display zoom scale or split the display. When a scale other than ‘No 
Zoom’ is selected, the Adjustment Menu displays a new selection labeled ‘View.’ Split screens display 
the same frequency (50kHz, 200kHz, or Dual) on both sides. The Zoom setting is divided into six 
display levels: 

  •   2X Split: shows two reduced-size sonar pictures at the same time. The right half of the display 

screen shows the complete sonar picture at its original scale. The left half shows a portion of the 
original picture at 1/2 depth scale. 

  •   2X Zoom: displays the 2X zoomed picture on the full screen and does not show the original 

depth scale.

  •   4X Split: shows two reduced pictures; the right at the original depth scale and the left at 1/4 the 

original depth scale.

  •   4X Zoom: displays only the 4X zoomed picture on the full screen. 
  •   Btm (Bottom) Split: shows two reduced pictures; the right at the original depth scale and the left 

showing sonar returns from the bottom up. All target depths read as a distance from the bottom.

  •   Btm (Bottom) Lock: displays only the Bottom Lock picture (returns from the bottom up) on the 

full screen. 

Once activated, the zoomed picture becomes the Sonar Page display. You may also cycle through the 

sonar zoom display levels by pressing the IN or OUT keys. The Zoom function can be deactivated by 
pressing the OUT key until the ‘No Zoom’ setting appears.