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3. ARP OPERATION
3-13
3.8 Displaying Target Data
The ARP mode provides the full functionality of ARP as required by the IMO
Resolution A.823(19) and IEC 60972-1, including display of range, bearing,
course, speed, CPA and TCPA of all plotted targets.
In head-up and head-up true bearing modes, target bearing, course and speed
shown in the upper-right target data field become true (suffix “T”) or relative
(suffix “R”) to own ship in accordance with the true/relative vector setting. In
north-up, course-up and true motion modes, the target data field always displays
true bearing, true course and speed over the ground.
3.8.1 Displaying individual target data
By keyboard
Roll the trackball to place the cursor on a desired ARP target and press the
[TARGET DATA] key. The target’s shape changes to a square. To erase a
target’s data from the data box, press the key again.
By trackball
1. With cursor inside the effective display area, roll the wheel to show “TARGET
DATA & ACQ / CURSOR MENU” in the guidance box.
2. Roll the trackball to place the cursor on a desired ARP target and then push
the left button.
3. To erase a target’s data from the data box, choose the target on the radar
display and then push the left button.
Target data display is as below.
RNG/BRG: Range and bearing from own ship to the selected target with suffix
“T” (True) or “R” (Relative).
COG/SOG (in case of GPS): Course and speed are displayed for the selected
target with suffix “T” (True) or “R” (relative). For manual speed input, CSE/STW
are shown.
CPA/TCPA: CPA (Closest Point of Approach) is the closest range a target will
approach to own ship. TCPA is the time to CPA. Both CPA and TCPA are
automatically calculated. When the CPA has passed clear of own ship, it is
indicated by a TCPA with a negative (-) sign. TCPA is counted to 99.9 min and
beyond this, it is indicate as TCPA> -99.9MIN.
BCR/BCT: BCR is the closest range at which the chosen target is predicted to
cross your ship’s bow. BCT is the time at which the chosen target is predicted to
cross your ship’s bow.