Onwa Marine Electronics KR-12X8 - Manual (Page 69)

Operation of ARPA
General
The Auto Plotter permits manual or automatic acquisition and automatic tracking
of up to 20 radar targets. An internal microprocessor calculates target data such as
speeds and courses and display the results in alphanumeric and by vectors. To
ensure the reliability of the displayed target data, the radar must be properly
adjusted for minimum sea returns and noise.
Principal Specifications
Acquisition and tracking:
Acquisition of up to 20 targets between 0.2 and 16 nm.
Automatic tracking of up to 20 acquired targets between 0.1 and 16 nm.
Vectors:
Vector length; 30s, 1,3,6,15,30 min.
Orientation; True velocity or relative velocity
Past positions: 5 past positions at intervals of 15,30s,1,2,3,6 min.
Alarm: Visual and audible alarms against targets violating CPA/TCPA limits,
Visual alarm against lost targets
Target discrimination: A target measuring about 800 m or more in the radial or
circumferential direction is regarded as a landmass and not acquired or tracked.
Echoes smaller than about 800 m are regarded as true targets.
Key Used Auto Plotter
The Auto plotter utilizes the following touchpad keys. Given below is a brief
description of these keys.
MENU: Display/Erase the main menu.
SELECT/CANCEL:
(Long press) Terminates plotting of the target selected with the cursor.
(Brief press) Displays the data of target selected with the cursor.
ACQ/ENTER: Acquires the target selected with the cursor.
62