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3. TARGET TRACKING (TT)
3-11
3.9 Vector Modes
Target vectors can be displayed relative to own ship's heading (Relative) or North
(True).
Note: IMO recommends the use of the true vector mode in sea stabilization or relative
vector mode for collision avoidance.
3.9.1 Description of vectors
Ground stabilization and sea stabilization
[SPD][System Sensor Settings][Local System Settings][Bottom][Water][True-G][True-
S].
Target vectors can be ground stabilized or sea stabilized in the True Motion mode. To
select speed over the ground or speed through the water data, open the page from
the or menu. Select for ground stabilization or for sea stabilization. The Vector mode
indication shows the stabilization mode in the true motion as [True-G] or [True-S].
Sea stabilization is a mode where own ship and all targets are referenced to the sea
using a compass heading and single-axis log water speed inputs in the true motion
mode. Ground stabilization is a mode where own ship and all targets are referenced
to the ground using the ground track or set and drift inputs. If the accuracy seems un-
satisfactory, enter set and drift corrections. Note that set and drift should not be used
when the radar is displaying AIS targets.
True vector
In the true motion mode, all fixed targets such as land, navigational marks and ships
at anchor remain stationary on the radar screen with vector length zero. But in the
presence of wind and/or current, the vectors appear on fixed targets representing the
reciprocal of set and drift affecting own ship unless set and drift values are properly
entered.
In the true vector mode, there are two types of stabilization: ground stabilization (True-
G) and sea stabilization (True-S). The stabilization mode is automatically selected ac-
cording to speed selection, as shown in the table on the next page. Manual selection
is available with [Stabilization Mode] in the [SPD] page in the [Sensor Settings] menu.
[Bottom], [True-G], [Water], [True-S].
Speed selection True vector mode
LOG(WT) True-S
LOG(WTC) True-G
LOG(BT) True-G
GPS(BT) True-G
REF(BT) True-G
MAN(WT) True-S
MAN(WTC) True-G