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Another useful feature of the GPSMAP 135 Sounder is the sounder zoom,
which allows you to instantly “zoom in” to look at a specific portion of the
sounder display by using the
Z
key. The sounder zoom function is divided into
four display levels:
• 2X Split Screen––Shows two reduced-size sonar pictures at the same time. The top
half of the display screen shows the complete sonar picture at its original scale. The
bottom half shows a portion of the original picture at 1/2 depth scale.
• 2X Full Screen––Displays the 2X zoomed picture on the full GPSMAP 135 Sounder
screen and does not show the original scale picture.
• 4X Split Screen––Shows two reduced pictures, with one at the original depth scale
and one at 1/4 the original depth scale.
• 4X Full Screen––Displays only the 4X zoomed picture on the full GPSMAP 135
Sounder screen.
Once activated, the zoomed picture becomes the sounder page display. Note:
the zoom function can only be deactivated by pressing the
Z
key up until the orig-
inal scale picture appears. Pressing
Q
will not turn off the zoom function.
The zoom function operates in either auto zoom or manual zoom. Auto zoom
will follow the bottom contour while manual zoom will display the selected
depth.
To access the sounder zoom function:
1. While viewing the sounder page, press
Z
down once. The 2X split screen will
appear. (Note: the current zoom scale will be displayed on the status bar at the
bottom of the screen).
2. Continue to press
Z
down to advance to further zoom screen levels.
3. To deactivate the sounder zoom function, press
Z
up until the original scale pic-
ture appears and a triple beep sounds.
For more on the zoom function, see pages 27-29.
9
GETTING STARTED
Sounder Page
A. Use the zoom window to view a smaller portion
of the complete range in greater detail.
B. Moving the zoom window allows you to view
anywhere between the surface and the bottom
quickly. See page 28 for directions on moving the
zoom window.
A
B
GPS 135 Rev C 8/4/98 4:17 PM Page 9