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2-15
Target full alarm
When the memory becomes full, the
memory full status is indicated and the
relevant indication appears on the screen
and a short beep sounds.
Manually acquired targets
The indication "MAN TARGET FULL" ap-
pears at the screen bottom and a short
beep tone sounds when the number of
manually acquired targets reaches 20 or
40 depending on whether auto acquisi-
tion is activated or not.
Automatically acquired targets
The indication "AUTO TARGET FULL" ap-
pears at the screen bottom and a short
beep tone sounds when the number of
automatically acquired targets reaches
20.
System failure alarm
When the ARP board receives no signal
input from the radar or external equip-
ment, the screen shows both "SYSTEM
FAIL" associated with an indication de-
noting offending equipment, also releas-
ing an aural alarm. The missing signals
are denoted as shown below:
Missing Signal Indication
*Speed log signal LOG
*Gyrocompass GYRO
Trigger signal from radar T
Video from radar V
*Bearing signal from
radar antenna
B
*Heading pulses from
radar antenna
H
*The alarm is available with or without
ARPA.
2.15 Trial Maneuver
Trial simulates the effect on all tracked
targets against own ship's maneuver with-
out interrupting the updating of target in-
formation.
There are two types of trial maneuvers:
static and dynamic.
Dynamic trial maneuver
A dynamic trial maneuver displays pre-
dicted positions of the tracked targets and
own ship. You enter own ship's intended
speed and course with a certain "delay
time." Assuming that all tracked targets
maintain their present speeds and
courses, the targets' and own ship's fu-
ture movements are simulated in one-sec-
ond increments indicating their predicted
positions in one-minute intervals as illus-
trated below.
The delay time represents the time lag
from the present time to the time when
own ship will actually start to change her
speed and/or course. You should there-
fore take into consideration own ship's
maneuvering characteristics such as rud-
der delay, turning delay and acceleration
delay. This is particularly important on
large vessels. How much the delay is set
the situation starts immediately and ends
in a minute.
In the example shown below, own ship
will advance straight ahead (even after a
maneuver) for a delay time of 5 minutes
and then alters speed and course until
operator-specified intended speed and
course are achieved (position OS7 in this
example).