Furuno BB FAR28x7 - Manual (Page 161)

3. ARP OPERATION
3-29
3.15 Trial Maneuver
The trial maneuver feature simulates the effect on all tracked targets against
own ship's maneuver without interrupting the updating of target information. It is
available for use with the ARPA function; it is inoperative on the ATA.
3.15.1 Types of trial maneuvers
There are two types of trial maneuvers: static and dynamic.
Dynamic trial maneuver
A dynamic trial maneuver displays predicted 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 future movements are simulated in
one-second increments indicating their predicted positions in one-minute
intervals as illustrated 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
therefore take into consideration own ship's maneuvering characteristics such as
rudder 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).
A A0
B
B0
OS0
A1
A2
A3
A4
A5
A6
A7
A8
OS1
OS2
OS3
OS4
OS5
OS6
OS7
OS8
B1
B2
B3
B4
B5
B6
B7
B8
Present own
ship position
Delay time = 5 min.
T
Dynamic trial maneuver
Note that once a dynamic trial maneuver is initiated, you cannot alter own ship's
trial speed, course or delay time until the trial maneuver is terminated.