How To Associate Tt And Ais Targets - Furuno FAR-2218-BB Operator's Manual

4. AIS OPERATION
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] in-
dication 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 associa-
tion criteria are met.
[OFF] : Disable association.
[AIS] : Use AIS symbols and AIS data.
[TT] : Use TT symbols and TT data.
Note: Association can also be switched on and off
from the screen by left-clicking the Association Usage
icon, shown below.
7. Referring to the table below, set the association criteria. Spin the scrollwheel to
adjust the value, then left-click to confirm the setting.
[GAP]
[RANGE]
[BEARING]
[SPEED]
[COURSE]
8. Close the menu.
4-18
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.
: Range in bearing direction between AIS target and tracked target.
(setting range: 0.000-0.050 (nm))
: Range direction difference from own ship to AIS target and tracked
target. (setting range: 0.000-0.100 (nm))
: Bearing difference from own ship to AIS target and tracked target.
(setting range: 0.0-9.9 (°))
: Speed difference between AIS target and tracked target.
(setting range: 0.0-6.0 (kn))
: Course difference between AIS target and tracked target.
(setting range: 0.0-25.0 (°))
TT ACQ MODE
indication