USING THE 350TX
MENU FUNCTIONS
which the Zoom range is constantly adjusted to 
show the bottom, or manually, in which the user 
controls the location of the Zoom range. 
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
When the unit is powered off, the Zoom menu returns to Zoom Off.
Depth Alarm. The 350TX contains an aud- ible alarm to warn you of shallow water depths. The alarm is adjustable in tenths (¹⁄₁₀ m) from 1 to 9.9 metres and in full metres from 10m to 30m (99'). Imperial measures are set to the whole foot from 3' to 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.
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