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7. Enter own ship's intended speed, course and delay time in the following manner:
Speed: Set with the VRM control.
Course: Set with the EBL control.
Delay time: Enter in minutes by hitting numeral keys. This is the time after which own ship
takes a new situation, not the time the simulation begins. Change the delay
time according to own ship loading condition, etc.
8. Press the [9] key again on the ARPA 1 menu to start a trial maneuver. During trial
maneuver, REL/TRUE vector can be selected.
9. Press the PLOT MENU to close the menu.
Trial maneuver takes place in three minutes with the letter "T" displayed at the bottom of the
screen. If any tracked target is predicted to be on a collision course with own ship (that is, the
target ship comes within preset CPA/TCPA limits), the target plot symbol changes to a triangle
(
∆
) and flashes. If this happens, change own ship's trial speed, course or delay time to obtain a
safe maneuver. The trial maneuver is automatically terminated and the normal radar picture is
restored three minutes later.
R/N/W versions: Target data in the trail maneuver mode is affected by the trail data.
"CAUTION! TARGET DATA IS THE RESULT OF TRIAL" is displayed. (Target data is not
affected on G version.)
Terminating trial maneuver
Press the PLOT MENU key and the [9] key at any time.
2.17 ARPA Performance Test
Test program is provided for assessing the ARPA overall performance. Note that normal
operation is interrupted and the label "XX " is displayed at the bottom of the screen during this
test. The test may be terminated at any moment.
To execute the performance test:
1. Select the north-up presentation mode on the 12 nm range.
2. Enter own ship speed of 0 knots.
3. Press the PLOT MENU key followed by the [0] key to show the ARPA 2 menu.
4. Press the [9] key to select ARP TRACK TEST. The display is cleared and a performance
test picture comes on.
5. Press the ENTER key.
An alert XX flickers during the test. It takes approximately 3 minutes for all vectors to be
displayed. The test does not need echo signals, gyro nor speed log input. 7 targets having
different speeds and courses, as shown in the table below, are simulated automatically.
6. The test continues for 5 minutes and then repeats.
To terminate the track test, press the STBY/TX key twice and the STBY display will appear.
Select any target with the cursor and check that the selected target shows the course and speed
as in the table. CPA and TCPA shown below are initial values which change with time.