True or relative vector, vector time
Vectors can be displayed relative to own ship’s heading (Relative) or with reference to the North (True). This feature is available in all presentation modes (compass must be working correctly). The current vector mode is indicated at the
Vector time (or the length of vectors) can be set to 30 seconds, 1, 3, 6, 15 or 30 minutes and the selected vector time is indicated at the
1.Press the [MENU] key followed by the [7] key twice to select PLOT.
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| PLOT MENU 1 |
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1. | MARK DISP |
| OFF | ON |
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2. | ERASE |
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3. | VEC REF |
| REL | TRUE |
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4. | VEC TIME |
| 30S | 1M | 3M | 6M |
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| 15M | 30M |
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5. | CPA SET |
| OFF | 0.5NM 1NM 1.5NM | ||||
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| 2NM | 3NM | 4NM |
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| 5NM | 6NM |
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6. | TCPA SET |
| 30S | 1M | 2M | 3M |
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| 4M | 5M | 6M | 12M | 15M | |
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7. | TRACK |
| OFF | ON |
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8. | AUDIO ALARM |
| OFF | ON |
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9. | INTVAL* |
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| 1M | 2M | 3M | 6M | |
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0. | ↓ * |
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* Requires ATA Board
Figure 1-26 PLOT menu
2.Press the [3] key to select REL or TRUE from the VECT REF field as appropriate, and then press the [ENTER/SELECT] key.
3.Press the [4] to select appropriate vector time from the VEC TIME field, and then press the [ENTER/SELECT] key.
4.Press the [MENU] key to close the menu.
The vector tip shows an estimated position of the target after the selected vector time elapses. It can be valuable to extend the vec- tor length to evaluate the risk of collision with any target.
Target data
The radar calculates motion trends (range, bearing, course, speed, CPA and TCPA) of all plotted targets.
In the
Reading the target data
Place the cursor on a plotted target and press the [ENTER/SELECT] key. Then, the follow- ing target data is displayed at the right side of the CRT.
RNG/BRG (Range/Bearing): Range and bearing from own ship to
CSE/SPD (Course/Speed): Course and speed are displayed for the
CPA/TCPA: CPA (Closest Point of Approach) is the closest range the target will approach to own ship. TCPA is the time to CPA. Both CPA and TCPA are automatically calculated. TCPA is counted up to 99.59 min and be- yond that it is indicated as TCPA > *99.59 MIN.
Terminating target plotting
With the EPA you can plot up to 10 targets. You may wish to terminate plotting of less important targets to newly plot other threat- ening targets.
With Trackball: Place the cursor (+) on a target which you do not want to be tracked any longer by operating the trackball and press the [CANCEL/CLEAR] key.
All Targets: To terminate plotting of all tar- gets at once:
1.Press the [MENU] key followed by the [7] key twice.