Furuno FR-10, Operator'S Manual

Page: 5 / 171

SAFETY INSTRUCTIONS
iii
WARNING
The TT function is a valuable aid to
navigation. However, the navigator
must check all aids available to avoid
collision.
- The TT automatically tracks an
automatically or manually acquired
radar target and calculates its course
and speed, indicating them with a
vector. Since the data generated by
the TT depends on the selected radar
targets, the radar must be optimally
tuned for use with the TT, 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 also be returns
from the sea surface and from clutter.
As the level of clutter changes with
the environment, the operator must
correctly adjust the sea and rain
clutter controls and the gain control so
that the target echoes do not dis-
appear from the radar screen.
Target Tracking (TT) safety information
CAUTIO CAUTION
The plotting accuracy and response of
this TT meets IMO standards. Tracking
accuracy is affected by the following:
• Tracking accuracy is affected by course
change. One to two minutes is required to
restore vectors to full accuracy after an
abrupt 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 approx. 15-30 seconds for
the higher relative speed; approx. 30-60
seconds for the lower relative speed. The
following factors can affect accuracy:
- Echo intensity
- Radar transmission pulse length
- Radar bearing error
- Heading sensor error
- Course change (own ship and targets)
TFT display
The high quality TFT (Thin Film Transistor) LCD displays 99.99% of its picture elements.
The remaining 0.01% may drop out or light. However, this is an inherent property of the TFT;
it is not a sign of malfunction.
CAUTION
The guard zone alarm and and Risk
Visualizer
TM are effective aids to
anti-collision.
Using these functions does not relieve
the operator of the responsibility to
keep a vigilant watch on his or her
surroundings.
The data presented by this equip-
ment is intended as a source of
navigation information.
The prudent navigator never relies
exclusively on any one source of
navigation information, for safety of
vessel and crew.