Garmin GPSMAP 168 Sounder - Manual (Page 49)

38
Reference
Sonar Page
Sonar Page
The Sonar Page is where your GPSMAP 168 Sounder becomes a powerful fi shfi nder/fl asher. The
top of the screen contains data fi elds which can display any of 27 selectable data fi eld options, while the
Adjustment Bar below the data fi elds allows direct access to the settings most commonly changed while
using the Sonar Page. These include the depth ‘Range’, ‘Zoom’ setting, ‘Gain’ (sensitivity) and ‘View’
(zoom mode only) of the unit. The middle of the page contains a right-to-left moving sonar image of
the water beneath your boat. (Note: Items appear as they pass under your transducer. Those items on
the right side of the screen are closer to you than those on the left.) Along the right side of the screen is
an adjustable scale which refl ects the depth of the area being displayed.
Fish are displayed as a darkened arch or a fi sh icon in three different sizes. Thermoclines are
shown as shades of gray. The area of strongest sonar return (or whiteline) is displayed as solid gray.
Typically, the bottom will be the primary whiteline. A thin whiteline indicates a soft bottom while a
thick whiteline shows a harder bottom. A black line is used to show the point where the water meets
the whiteline. This black line will follow the contour of the bottom and show any objects of reasonable
size. For more information on understanding sonar and the display, see Appendix H.
Using the Adjustment Bar
The Adjustment Bar allows direct access to the settings most commonly changed while using the
unit. These include the depth ‘Range’, ‘Zoom’ setting, the ‘Gain’ (sensitivity), ‘View’ adjustment, and
‘Line’ (Depth Line) of the unit. The ‘View’ setting will only display when the Sonar Page is in split screen
mode. The ‘Line’ setting will appear only when the Depth Line is activated.
To select a setting from the Adjustment Bar:
1. Using the ARROW KEYPAD, place the highlight (white bar) over the desired selection by pressing
RIGHT or LEFT on the ARROW KEYPAD and the current setting will be displayed in the highlight.
If you wish to review the available settings before making a change, press ENTER/MARK to
activate the adjustment list. To immediately change the setting, press UP or DOWN on the ARROW
KEYPAD.
Sonar Page
Data Fields
Depth
Line
Depth
Scale
Flasher
Adjustment
Bar
Fish Arch
Bottom
Whiteline
Thermocline
2X Zoom View Normal View
(2X Split Screen Shown)
Fish
Symbols
with
Depth
Bar
represents
area shown
on 2X View
168 Manual Part 1.indd 38 11/18/2002, 3:36:35 PM