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3-1
3. ARP OPERATION
3.1 Usage Precautions
• This function is designed to meet the IMO requirements of both ARPA and
ATA, and the desired function is selected during the installation of the
equipment. For sake of brevity, this manual uses “ARP” when referring to
ARPA or ATA.
• The plotting accuracy and response of this ARP meets IMO standards.
Tracking accuracy is affected by the following:
• Tracking accuracy is affected by course change. One to two minutes is
needed 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 on the order of 15-30 seconds for high relative
speed; 30-60 seconds for low relative speed.
• The data generated by this ARP are intended for reference only. Refer to
official nautical charts for detailed and up-to-date information.
• A target measuring 800 m or more in the radial or circumferential direction is
regarded as a landmass and not acquired or tracked. Echoes smaller than
800 m are regarded as targets to be tracked.