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Sonar Page
Getting Started
Another useful feature of the GPSMAP 168 Sounder is the sonar zoom, which allows you to
instantly “zoom in” to look at a specifi c portion of the sounder display by using the either the IN or
OUT key. The Zoom function is divided into four 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 GPSMAP 168 Sounder screen and does not
show the original scale picture.
• 4X Split––Shows two reduced pictures, with one at the original depth scale and one at 1/4 the
original depth scale.
• 4X Zoom––Displays only the 4X zoomed picture on the full GPSMAP 168 Sounder screen.
Once activated, the zoomed picture becomes the Sonar Page display. Note: The Zoom function can
be deactivated by pressing the OUT key until the ‘No Zoom’ setting appears.
Once in Zoom mode, you can control the view of the left side of the split. When the unit is set to
one of the Zoom settings, and additional optional named ‘View’ will appear on the adjustment bar. The
View function operates in either ‘Auto View’ or ‘Fixed View’. Auto View will follow the bottom contour
while Fixed View will display the selected depth.
To access the Sonar Zoom function:
1. While viewing the Sonar Page, press IN once. The 2X split screen will appear.
2. Continue to press IN to advance to further zoom screen levels.
3. To deactivate the Zoom function, press OUT until the original scale (No Zoom) appears.
4. Press ENTER/MARK or press LEFT or RIGHT on the ARROW KEYPAD.
For more on the Zoom, View and other Sonar Page functions, see pages 38-44.
To learn more about how sonar works, see Appendix H.
2X Zoom
View
Normal
View
Sonar 2X Split Screen (shown with
Depth Line and Flasher)
Sonar Zoom
Adjustment
Bar
represents
area shown
on 2X View
168 Manual Part 1.indd 15 11/18/2002, 3:36:27 PM