Furuno 1832, 1942, 1932 manual Targets violating CPA/TCPA, Limits, Visual alarm against lost

Operation of ARP-10

General

The Auto Plotter ARP-10 is an optional cir- cuit board which is accommodated in the dis- play unit of the MODEL 1832, 1932 and 1942 radars.

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 speeds and courses and displays the results in alphanu- meric and by vectors. To ensure the reliabil- ity 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 velocity

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 targets.

Keys Used for Auto Plotter

The Auto plotter utilizes the following touchpad keys. Given below is a brief descrip- tion of these keys.

MENU: Displays/Erases the main menu.

SELECT/CANCEL:

(Long press) Terminates plotting of the target selected with the cursor.

(Brief press) Displays the data of target se- lected with the cursor.

ACQ/ENTER: Acquires the target selected with the cursor.

ARP-10 MENU Operation

The ARP-10 MENU operation includes the followings;

Display: Turns on/off the plot symbols, past positions and target data.

All Cancel: Cancels the tracking of all targets.

Vector Ref: Selects relative vector or true vectors. To select your choice, open the ARP-10 menu, and the legend Rel and True appear on the "3. Vector Ref" line. Operate the omnipad. When your selection is in the reverse video, press the [ACQ/ENTER] key.

Vector Length: Selects vector time.

History: Selects past position plot interval.

CPA Set: Selects CPA alarm limit. When a target is predicted to come within this limit, an aural 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.

AP-3