Furuno FR-7112 manual Terminating Tracking of Targets, Displaying Target Data, Individual targets

6.6Terminating Tracking of Targets

When the ARP-10 has acquired 10 targets, no more acquisition occurs unless targets are lost. Should this happen, cancel tracking of indi- vidual targets or all targets by the procedure described below.

Individual targets

Place the cursor (+) on the target which you do not want to be tracked any longer by operating the trackball and press and hold down the [SE- LECT/CANCEL] key.

All targets

Tracking of all targets can be canceled from the ARP-10 MENU.

1.Open the “ARP-10 MENU”.

2.Select “2. All Cancel”.

3.Press the [ACQ/ENTER] key.

6.7 Displaying Target Data

The ARP-10 calculates motion trends (range, bearing, course, speed, CPA and TCPA) of all targets being tracked at the ARPA Data area.

To turn ARPA data on;

1.Press the [MENU] key.

2.Select the “DISP DATA”.

3.Press the [ACQ/ENTER] key to select the message for “ARP” or “NAV and ARP”.

4.Press the [ACQ/ENTER] key to set.

5.Press the [MENU] key to close the menu.

Place the cursor on a wanted target and press the [SELECT/CANCEL] key. Data on the se- lected target is displayed at the bottom of the screen. The symbol of the selected target gets twice as large as the normal circle. The data in- cludes the following;

RNG/BRG (Range/Bearing): Range and bear- ing from own ship to the last-plotted or selected target position with suffix “T” (True) or “M” (Magnetic). For true bearings suffix “T” is used in case of gyrocompass input and suffix “M” is used in case of magnetic compass input.

Note: “M” is not displayed on N-type radar.

COURSE/SPEED (Course/Speed): Course and speed are displayed for the last-plotted or selected target with suffix “T” (True) or “M” (Magnetic). For true bearings suffix “T” is used in case of gyrocompass input and suffix “M” is used in case of magnetic compass input.

Note: “M” is not displayed on N-type radar.

CPA (Closest Point of Approach): The clos- est range a target will approach to own ship. Do not confuse it with the operator preset CPA alarm limit.

TCPA: The time to CPA measured with present speeds of own ship and the targets. Both CPA and TCPA are automatically calculated. When a target ship has passed clear of own ship, the CPA is displayed and the TCPA appears as “**.*”. TCPA is counted up to 99.9 min. and beyond this it is indicated as TCPA>99.9 min.

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