Furuno FR-10, Operator'S Manual

Page: 101 / 171

4-1
4. TT OPERATION
The TT (Target Tracking) feature manually or automatically acquires and tracks (The
maximum number of targets depend on the radar sensor). Once a target is acquired,
a target is automatically tracked. The target tracking range varies depending on your
antenna unit. Heading, positioning and ship’s speed information are required to use
this function.
4.1 Precautions
4.2 Controls when Using TT Function
ENTER key: Acquire cursor-selected target. Display data for tracked target (in the
data box at the bottom of the screen).
CANCEL/HL OFF key: Remove data of cursor-selected tracked target from the data
box. Stop tracking the cursor-selected target (when its data is not displayed in the
databox).
MENU key: Access the [Target] menu.
Do not depend on one navigation device
for the navigation of the ship. The
navigator must check all aids available
to confirm position. Electronic aids are
not a replacement for basic navigation
principles and common sense.
·
The TT automatically tracks an
automatically or manually acquired radar
target and calculates its course and
speed, indicating them by a vector. Since
the data from the auto plotter depend on
the selected radar targets, the radar must
be optimally tuned for use with the auto
plotter, to ensure required targets will not
be lost or unnecessary targets like sea
returns and noise will not be acquired
and tracked.
·
A target is not always a landmass, reef,
ship, but can be returns from the sea
surface and clutter. As the level of clutter
changes with the environment, the
operator must correctly adjust the rain
clutter, sea clutter and gain controls so
that the target echoes do not disappear
from the radar screen.
The plotting accuracy and response of
this TT meets IMO standards.
The tracking accuracy is affected by the
following:
·
The t racking accuracy is affected by
course change. One to two minutes is
required to restore vectors to full
accuracy after a sudden course change.
(The actual amount depends on
gyrocompass specifications.)
·
The amount of tracking delay is inversely
proportional to the relative speed of the
target. Delay is on the order of 15-30
seconds for high relative speed; 30-60
seconds for low relative speed.
The display accuracy is affected by the
following:
·
Echo intensity
·
Pulse width of radar transmission
·
Radar bearing error
·
Gyrocompass error
·
Course change (your ship or target)
WARNING
CAUTION