Interphase Color Twinscope - Scan Control and Alarm Settings; Scanning Speed and Beam Adjustment; Alarm Setting and Configuration

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Scanning Speed
The Color Twinscope has two scanning speeds. Fast -
indicated with two right facing triangles (

), and slow,
indicated with one right facing triangle(

). In the faster
mode, the display resolution is reduced because the number
of scanning samples is reduced.
Alarm Adjustment
A forward looking alarm can be set in the downlookin, the
vertical and in the horizontal scan modes. When the alarm is
set, a red “alarm” line and an alarm depth box appears on
the display to indicate the alarm setting and the fact that it is
active.
In the vertical scan mode, the alarm will sound if a target
appears above the alarm line. In the horizontal scan mode,
the alarm will sound if a target is closer to the boat than the
alarm line. See diagrams at left.
To set the alarm, press any of the five unmarked softkeys
below the display to bring up the softkey menu. Then, press
the softkey beneath the ALARM symbol to bring up the
ALARM MENU.
To adjust the alarm setting, use the buttons below the 


symbols in the ALARM MENU, or the NAV or UP/
DOWN button. Press the softkey button below the EXIT
symbol to save the setting and exit, or press the button below
the CLEAR symbol to disable the ALARM and exit.
Beam Adjustment
The Color Twinscope can scan a 90 degree arc (segment) in
either the vertical or horizontal direction. In some cases you
may want to reduce the size of the sector and then steer it in
a particular direction. Reducing the sector size is one way to
increase the scanning speed, as time isn’t wasted by
scanning unwated areas. The BEAM can be adjusted in
both the vertical and horizontal scanning modes.
To adjust the beam, press any of the five unmarked softkeys
below the display to bring up the softkey menu and
thenpress the softkey beneath the BEAM symbol to bring up
the BEAM MENU.
CURSR
VERT
HORIZ
DOWN
DATA
RANGE
GAIN
PWR
FORWARD LOOKING SONAR

CURSR
VERT
HORIZ
DOWN DATA
RANGE
GAIN
PWR
FORWARD LOOKING SONAR

50 Ft
100 Ft
77.5 Ft
Alarm Line
Alarm Setting
Targets On This Side of Line
Will Cause Alarm to Sound
CURSR
VERT HORIZ
DOWN
DATA
RANGE
GAIN
PWR
FORWARD LOOKING SONAR

Depth 13.2 Ft
25 50
25
12.5
5 Ft
EXIT CLEAR DOWN UP
Use NAV Button UP/Down 

 to adjust
beam sector width
EXIT CLEAR