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17
USING THE 250DX
MENU FUNCTIONS
Automatic Zoom is especially helpful when looking for structure or bottom
detail. The Automatic Zoom keeps the bottom in view even in quickly changing
terrain, but is most useful in flatter areas without considerable depth variation.
Manual Zoom provides detailed information of any area from the surface to the
bottom. In manual Zoom, the Zoom range does not move as the terrain
changes.
When the range is shown in the menu, the upper
number represents the top of the current Zoom
range. The lower number represents the bottom of
the Zoom range. Use the UP and DOWN ARROW
buttons to move this range. The upper number can
never be less than 0 (the surface of the water), and
the lower number can never be greater than the
active depth range. The difference between the
two numbers (the Zoom range) is preset and
determined by the active depth range.
Once manual Zoom is selected, the display
appears the same as in Auto Zoom, but the zoom
range does not change automatically.
To disable Zoom, press the MENU button until the
Zoom menu is on-screen. Use the UP ARROW to
highlight Off, and let the menu time out.
When the unit is powered off, the Zoom menu
returns to Zoom Off.
Depth Alarm. The 250DX contains an audible
alarm to warn you of shallow water depths. The
alarm is adjustable to depths of 1m (3') to 30m
(99'). When the alarm is enabled, an audible
alarm sounds if the water beneath the boat is
equal to or less than the selected alarm depth.
The alarm sounds continuously for about five
seconds, and then intermittently to remind you
that you are still in shallow water.