User's Manual

MDC-5200/5500 Series Chapter 3 Alarm
0093155002-03 3-7
3.3 Guard zone alarm
Guard zone alarm is an alarm system using TT (ARPA) tracked target or an AIS active target signal.
If a TT (ARPA) tracked target or an AIS active target enters a guard zone, then a large, red symbol is
displayed and [ALARM] is generated.
If a TT (ARPA) un-tracked target or an AIS sleeping target enters there, then no alarm is generated.
How to set guard zone alarm
1 Press MENU key to display “Menu”.
Select [ALARM] => [GUARD ZONE] => [ON], and press ENT key.
The color of EBL1, EBL2, VRM1 and VRM2 key’s light turns red. (MDC-5500 series)
symbol will be shown at the left of numerical indication of [BRG REL] or [WIDTH] and [RNG] or
[DEPTH] menu.
Blue dashed line of guard zone alarm area and orange dashed circle line will be displayed on the
display.
2 Press EBL1 or EBL2 key, and Select an item to be set between [BRG REL] and [WIDTH] by using
EBL/VRM knob (MDC-5200 series) or EBL knob (MDC-5500 series).
In the same way, press VRM1 or VRM2 key, and select an item to be set between [RNG] and
[DEPTH] by using EBL/VRM knob (MDC-5200 series) or VRM knob (MDC-5500 series).
The selected item is shown with a symbol at the left of numerical indication at the guard zone
alarm in the menu display.
Note: The changing item by using EBL/VRM knob will be displayed with yellow characters.
(MDC-5200 series)
3 When the setting of the guard zone alarm area is completed, then press ENT key, orange dashed
circle line will disappear, and guard zone area alarm will be activated.
Note: If the guard zone alarm area is set in the whole circumference, [WIDTH] needs to be set the 0.0˚
or 360.0˚.
Orange dashed
circle line
Blue dotted line of
guard zone alarm area
GUARD ZONE
BRG REL 338.0˚
WIDTH 115.0˚
RNG 006.0NM
DEPTH 002.0NM
(MDC-5200 series)
EBL/VRM knob is used
for setup.
(MDC-5500 series)
EBL knob and VRM knob
are used for setup.
BRG REL
WIDTH
DEPTH
RNG