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2.2 Keypads for ARPA
The ARPA uses the keys on the plotting keyboard on the right side of the radar screen and
two keys on the control head.
PLOT MENU: Shows/hides ARPA menus.
Plot Symbol keys: Select specific plot symbols for
manually acquired targets.
TARGET CANCEL: Terminates tracking of a
single target specified by the trackball if the key is
pressed with a hit-and-release action. If the key is
held depressed for about 3 seconds, tracking of all
targets is terminated.
ENTER: Registers menu options selected.
VECTOR: Selects true or relative presentation of
target vectors.
TARGET DATA: Displays data on one of tracked
targets selected by the trackball.
LOST TARGET: Silences the lost target aural
alarm and erases the lost target symbol.
ACQ (on control head): Manually acquires a target.
AUDIO OFF (on control head): Silences aural
alarm.
HL
OFF
1
OFF
CENTER
4
EBL
7
TARGET
TRAILS
CANCEL
PANEL
BRILL
2
VECTOR
5
CHART
ALIGN
8
CU, TM
RESET
0
MODE
3
LOST
TARGET
6
MARK
9
A/C
AUTO
ENTER
TARGET
CANCEL
TARGET
DATA
ACQ
AUDIO
OFF
RADAR
MENU
PLOT
MENU
NAV
MENU
Plotting keypad
CRITERIA OF TRACKING
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.