How To Set Vector Length And Vector Motion - Furuno FMD-3100 Operator's Manual

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.
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 select-
ed according to speed selection, as shown in the table below.
Relative vector
Relative vectors on targets that are not moving over the ground such as land, naviga-
tional marks and ships at anchor will represent the reciprocal of own ship's ground
track. A target whose vector passes through own ship is on a collision course. (Dotted
lines in the figure are for explanation only.)
Target on
collision
course
True vectors in
head-up mode
To set the vector, click the vector time and vector reference indications in the [TT/AIS]
page to set them.
Speed selection
LOG(WT)
LOG(BT)
POSN
REF
MAN
MAN w/set & drift
Buoy
Target on
collision
Own ship
course
Relative vectors in
head-up mode
13. TRACKED TARGET (TT) FUNCTIONS
True vector mode
True-S
True-G
True-G
True-G
True-S
True-G
Buoy
Own ship
13-5