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"This device was designed and manufactured to comply with the International Mari-
time Organization (IMO) Performance Standards for Automatic Radar Plotting Aids
(ARPA)."
WARNING
If your ship is 10,000 or more gross tons and scheduled to operate in the navigable waters of
the United States, make sure the above label is attached on the ARPA. Otherwise please
make one yourself by typing and gluing overleaf with the transparent seal.
Precautions on high speed craft
Assume your ship is making 40 kt and a target ship is approaching at 40 kt right toward
you. Then the relative speed is 80 kt. With the antenna revolving at 42 rpm, the target blip
appears jumping to a new location 59 m nearer. This jump corresponds to 23 mm on the
360 mm display using the 0.25 nm range scale. On such a short range you may lose the
track of target in the midst of sea clutter, random noise or other targets. Use one step larger
range scale.
ARPA can fail to track a target when the relative speed exceeds 100 kt.
About This Manual
This manual is designed to provide information on operation and maintenance of the FR-2805
series radars as well as fault diagnosis and troubleshooting procedures which may be per-
formed by suitably qualified personnel on board.
In producing this manual, we tried to provide as "user friendly" an operation guide as possible
to the many functions of this sophisticated equipment. We would appreciated feedback from
you about this manual. Your comments and suggestions would be valuable inputs for future
improvement.
Categorization by specification
See the table on the next page.