7.Terminating Tracking of Targets
When the ATA has acquired 10 targets, no more acquisition occurs unless targets are lost. Should this happen, cancel tracking of individual targets or all targets by the proce- dure described below.
Individual targets
Place the cursor (+) on a target which you do not want to be tracked any longer by operat- ing the trackball and press the [CANCEL/ CLEAR] key.
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.
Vector start time
Whenever the range is changed the vectors for tracked targets is reestablished. You can select when to start reestablishment of the vectors with VECT START on the PLOT MENU 2 menu. The operator has the choices of 1 min or 20 scans.
All targets
All targets can be canceled from PLOT menu as follows.
1.Press [MENU], [7], [7] to show PLOT MENU 1.
2.Press the [2] key twice to select ERASE.
3.Press the [ENTER/SELECT] key.
4.Press the [MENU] key.
8. Vectors
True or relative vector
Target vectors are displayed in relative or true mode. Own ship does not have a vector in relative mode. You may select true or rela- tive vector with VECT REF on PLOT MENU 1 menu.
Note: The indication TRUE VECTOR ap- pears in red characters when the true vector is selected on relative motion displays.
Vector time
From PLOT MENU 1, VECT 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 on the screen.
9. Displaying Target Data
The ATA calculates motion trends (range, bearing, course, speed, CPA and TCPA) of all targets under tracking, and displays data of selected target at the top right corner of the screen.
Note: At a speed under 5 kt the target data is displayed with a delay due to filtration pro- cessing.
Approx. position of target after
elapse of vector time
Vector Time
Vector
Plot Symbol
RNG | 5.25NM |
|
| ||
BRG | 182.2° | T |
|
| |
CSE | 42.2° T |
|
| ||
SPD | 8.6KT |
|
|
|
|
CPA | 8.3NM |
|
|
| Range at CPA |
|
|
| |||
TCPA 45:32 |
|
|
| Time to CPA | |
|
|
| |||
|
|
|
|
|
|
Figure 7 Target data example
8
