Scanning Speed; Alarm Adjustment; Beam Adjustment - Interphase Color Twinscope Operation Manual

100 Ft
50 Ft
77.5 Ft
FORWARD LOOKING SONAR
Targets On This Side of Line
Alarm Setting
Will Cause Alarm to Sound
25
Depth 13.2 Ft
12.5
5 Ft
25
FORWARD LOOKING SONAR
EXIT CLEAR
EXIT CLEAR
FORWARD LOOKING SONAR
Use NAV Button UP/Down
beam sector width
Alarm Line
CURSR PWR
VERT HORIZ
DOWN DATA
GAIN
RANGE
CURSR PWR
50
VERT HORIZ
DATA
DOWN
RANGE GAIN
DOWN UP
CURSR PWR
VERT
HORIZ
DATA
DOWN
RANGE GAIN
to adjust

Scanning Speed

The Color Twinscope has two scanning speeds. Fast -
indicated with two right facing triangles (
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.
28
), and slow,