Interphase Color Twinscope, Operation Manual

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adjustments simply press the soft key labeled “ LAST ”
to return to the main forward looking menu.
Alarm Adjustment
In the forward looking display or view, alarms may be
set for targets which are shallower than, deeper than, or
within a specific zone of adjustable depth settings.
To adjust or clear the alarm settings, press the soft key
labeled “
ALARM ” to bring up the forward looking
alarm menu choices. Pressing the " DEEP " or " SHAL. "
soft keys brings up sub-menus to set, adjust or clear the
Shallow, Deep and Zone Alarms. As either the up or
down keys are pressed and held down, or the large knob
is rotated, a vertical bar on the left side of the screen
(just below the boat icon) will move to show the area
covered by the depth alarm. In addition, a horizontal
line will appear across the display. Whenever a solidly
displayed target appears at the same depth as that
covered by the alarm bar, the audible alarm sounds to
warn you of underwater targets or changing bottom
conditions. (
Note : the horizontal line will disappear a
few seconds after the alarm is adjusted, but the vertical
bar will remain.)
The Shallow Alarm is often used to alert the user to
shallowing bottom conditions and the presence of
underwater targets such as fish, and when activated,
will sound a rapid beeping. The Deep Alarm is often
used in conjunction with the Shallow Alarm to define a
depth range. If the depth becomes less or greater than
the alarm settings, the audio alarm will sound as a
warning. If the Deep alarm is activated, the
Twinscope
will make a slow beeping noise. A Zone Alarm can be
created by using both the Shallow and Deep Alarms. If
the Shallow and the Deep alarm bars on the left side of
the display are “overlapped” (that is the Shallow Alarm
bar overlaps the Deep Alarm bar) a new Zone Alarm
will result and be displayed. When the Zone Alarm is
activated, the
Twinscope will sound a medium speed
beeping.
Press the " CLEAR " soft key to clear the
alarm or
alarms you previously set. Press " CLEAR " in the main
alarm menu to clear all alarms in this view
simultaneously, or press "
CLEAR " in the sub-menus to
clear the selected Shallow or Deep Alarm.