Interphase Twinscope Operation Manual page 64

Alarm Adjustment
In the forward looking display or view, a forward
alarm may be set for targets which are closer than a
present distance.
To adjust or clear the alarm settings, press the soft
key labeled "ALARM" to bring up the forward
looking alarm menu choices. As either the up or
down keys are pressed and held down, or the large
knob is rotated counterclockwise , a horizontal bar
will move from the bottom of the display towards
the top. A vertical bar will also move along the
range scale. The horizontal and vertical bar indicate
the alarm range. Any strong target between the boat
(at the bottom of the display) and the alarm bar will
cause the alarm to sound. (Note: the horizontal line
will disappear a few seconds after the alarm is
adjusted, but the vertical bar will remain to indicate
the alarms setting.)
To deactivate the alarm either press the "CLEAR"
soft key to clear the forward alarm, or rotate the
control knob clockwise until the alarm bar
disappears at the bottom of the display.
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