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5-10
(a) Immediately after acquisition, this plot
symbol is shown in broken lines.
(b) Within 20 scans (or 1 min) of the antenna
after acquisition, a vector appears to show a
trend of movement.
(c) Within 60 scans (or 3 min) of the antenna
after acquisition, the plot symbol changes to
a small circle indicating steady-state
tracking condition.
Notes on manual acquisition
1) For successful acquisition, the target to be acquired should be within 0.2 to 32 nm from
own ship and not obscured by sea or rain clutter.
2) When you have acquired 30 targets manually, the message MAN TARGET FULL is
displayed at the screen bottom. Cancel tracking of non-threatening targets if you wish
to acquire additional targets manually. (See “5.5.3 Terminating tracking of acquired
targets” on page 5-9.)
CAUTION
TARGET SWAP
When a target being tracked nears
another target being tracked, the targets
may be “swapped”. When two targets
acquired either automatically or manu-
ally come close to each other, one of the
two may become a Lost Target. Should
this happen, manual re-acquisition of the
Lost Target may be required after the
two have separated.
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.
5.7 Changing Plot Symbol Size, Plot Symbols
5.7.1 Changing plot symbol size
To choose a large or standard size for all plot symbols:
1. Press the [PLOT MENU] key followed by the [0] key to show the ARPA 2 menu.
2. Press the [6] key to select MARK SIZE.
3. Further press the [6] key to select (or highlight) STANDARD or LARGE as appropriate.
4. Press the [ENTER] key to conclude your selection followed by the [PLOT MENU] key
to close the ARPA 2 menu.