Furuno 1942 MARK-2 - Manual (Page 38)

6-2
6.1 General
The Auto Plotter ARP-10 is an optional cir-
cuit board which is accommodated in the dis-
play unit of this radar (24 rpm only) radars. It
requires heading data to function.
The Auto Plotter permits manual or automatic
acquisition and automatic tracking of up to
10 radar targets. An internal microprocessor
calculates target data such as speed and
course and displays the results in alphanu-
meric data and by vector. To ensure the reli-
ability 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 10 targets between
0.2 and 16 nm.
Automatic tracking of up to 10 acquired
targets between 0.1 and 16 nm.
Vectors
Vector length: 30 s, 1, 3, 6, 15, 30 min.
Orientation: True velocity or relative ve-
locity
Past positions: 5 past positions at intervals
of 15, 30 s, 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 circum-
ferential direction is regarded as a landmass
and not acquired or tracked. Echoes smaller
than about 800 m are regarded as true tar-
gets.
Keys used for auto plotter
The ARP-10 uses the following touchpad
keys. Given below is a brief description of
these keys.
MENU:
opens/closes the main menu.
SELECT/CANCEL:
A long press terminates plotting of the target
selected with the cursor , and a brief press
displays the data of the target selected with
the cursor.
ACQ/ENTER:
Acquires the target selected
with the cursor.
6.2 ARP-10 MENU Operation
The ARP-10 MENU contains the following
items.
Display:
Turns on/off the plot symbols, past
positions and target data.
All Cancel:
Cancels the tracking of all
targets.
Vector Ref:
Selects relative or true vectors.
To select your choice, open the ARP-10
menu. Select “3 V ector Ref” to Relative or
Ture, and then, press the [ACQ/ENTER] key.
Vector Length:
Selects vector time.
History:
Selects past position plot interval.
CPA Set:
Selects CP A alarm limit. When a
target is predicted to come within this limit,
an audible alarm sounds and at the same time
the corresponding target symbol changes to
a blinking triangle.
Note: If the preset CPA limit is set at OFF, a
target which is on collision course will not
produce an alarm.
TCPA Set: Selects TCPA alarm limit.
Auto ACQ:
Turns on/off Auto Acquisition Area.
Activating the auto plotter
To activate the Auto Plotter, follow the steps
shown below.
1. Adjust the GAIN, A/C SEA and A/C RAIN
controls for proper radar picture.
2. Press the [MENU] key to open the main
menu.