Operator's Manual

13. TRACKED TARGET (TT) FUNCTIONS
13-4
13.4.2 How to set the lost TT alarm filter
If you are in a congested area the lost TT alarm may sound against many TT. In this
case, you can prevent the alarm from sounding against TT that are under a certain
range and/or speed.
1. Right-click the setting of [Lost TGT] on the [TT/AIS] page in the [Overlay/NAV
Tools] box, select [Setting] and open the [Setting.2] page.
(The [Setting.2] page can also be opened from the menu (MENU[TT/
AIS][Setting.1][Setting.2].)
2. In the [TT Lost Target Filter] window, set the maximum range to track a target and
the minimum ship speed to track.
MAX Range: The maximum range at which to track a lost target. A TT not within
this range is not tracked.
MIN Ship Speed: A TT whose speed is slower than set here does not trigger the
lost target alarm.
3. Click the [ON/OFF] button to show ON or OFF as appropriate.
13.5 How to Set Vector Length and Vector Motion
Ground stabilization and sea stabilization
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 [SPD] page
from the [System Sensor Settings] or [Local System Settings] menu. Select [Bottom]
for ground stabilization or [Water] 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.
True vector
In the true motion mode, all fixed targets such as land, navigational marks and ships
at anchor remain stationary on the radar overlay 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.