4. AIS OPERATION
4-19
4.15
How to Associate TT and AIS Targets
An AIS-equipped ship is usually displayed by two symbols on the radar display. This
is because the AIS ship position is measured by a GPS navigator (L/L) whereas the
radar detects the same ship by PPI principle (range and bearing relative to own ship
radar antenna).
To avoid the presentation of two target symbols for the same physical target, use the
“association” function. If target data from both AIS and TT are available and if the as-
sociation criteria are fulfilled, either the AIS or TT symbol is presented according to the
association method selected.
Association will not happen between AIS and TT if the AIS target is sleeping or the AIS
target is lost.
1. Confirm that the [TT ACQ MODE]
indication shows "AUTO", "AUTO
MAN" or "MAN".
2. Open the menu.
3. Select [5 TT•AIS].
4. Select [7 TARGET ASSOCIATION].
5. Select [2 ASSOCIATION TGT TYPE].
6. Select [OFF], [AIS] or [TT], as appropriate, to select
which symbols and data to display when the associ-
ation criteria are met.
Note:
Association can also be switched on and off
from the screen by left-clicking the Association Us-
age icon, shown below.
7. Referring to the list below, set the association criteria. Spin the scrollwheel to ad-
just the value, then left-click to confirm the setting.
8. Close the menu.
[OFF]
: Disable association.
[AIS]
: Use AIS symbols and AIS data.
[TT]
: Use TT symbols and TT data.
[3 GAP]
: Range between AIS target and tracked target.
(setting range: 0.000-0.050 (NM))
[4 RANGE]
: Range direction difference from own ship to AIS target and tracked
target. (setting range: 0.000-0.100 (NM))
[5 BEARING]
: Bearing difference from own ship to AIS target and tracked target.
(setting range: 0.0-9.9 (°))
[6 SPEED]
: Speed difference between AIS target and tracked target.
(setting range: 0.0-6.0 (kn))
[7 COURSE]
: Course difference between AIS target and tracked target.
(setting range: 0.0-25.0 (°))
TT ACQ MODE
indication
Left-click the association icon to change the association setting.
>: Use TT Symbols and data.
<: Use AIS symbols and data.
No indication: Association is disabled.
Summary of Contents for FAR-2218
Page 132: ...1 OPERATIONAL OVERVIEW 1 110 This page is intentionally left blank ...
Page 176: ...3 TARGET TRACKING TT 3 36 This page is intentionally left blank ...
Page 202: ...4 AIS OPERATION 4 26 This page is intentionally left blank ...
Page 232: ...5 VIDEO PLOTTER OPERATION 5 30 This page is intentionally left blank ...
Page 294: ......