Bottom Hardness; Alarm Adjustment - Interphase Proble Operation Manual

Hardness (White-Line)
If the softkey labeled "HARD" is pressed, the display
will show the bottom as a thin line separated by a shaded
area. This mode can be used to find detail close to the
bottom or to indicate the bottom composition. The
thinner the shaded area the softer the bottom. A thick
shaded area indicates a hard or rocky bottom.

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 alarm menu choices.
Pressing the "DEEP" or "SHAL" softkeys brings up sub-
menus to set, adjust or clear the alarms. As either the
" " or " " keys are pressed and held down, or the front
panel knob is rotated, a vertical bar on the left side of the
screen (just below the boat icon) shows the area covered
by the depth alarm. 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.
The S
hallow Alarm is often used to alert the user to
shallowing bottom conditions and the presence of
underwater targets such as fish. 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.
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.
Pressing the "FISH" softkey activates the fish alarm.
This alarm will activate when the unit detects suspended
returns that it interprets as fish. Press FISH again to
deavtivate the fish alarm. Note: The fish alarm is an
independant alarm and will not be deactivated by
pressing CLEAR as described below.
Press the "CLEAR" softkey to clear the alarm or alarms
you previously set. Press "CLEAR" in the main alarm
menu to clear all alarms simultaneously, or press
"CLEAR" in the sub-menus to clear the selected Shallow
or Deep Alarm.
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