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3-5
A/C SEA control
For optimum range SART detection, this
control should be set to the minimum. Care
should be exercised as wanted target in
sea clutter may be obscured. Note also
that in clutter conditions the first few dots
of the SART response may not be detect-
able, irrespective of the setting of the anti-
clutter sea control. In this case, the position
of the SART may be estimated by mea-
suring 9.5 nm miles from the furthest dot
back towards own ship.
Some sets have automatic/manual anti-
clutter sea control facilities in which case
the operator should switch to manual.
A/C RAIN control
This should be used normally (to break up
areas of rain) when trying to detect a SART
response which, being a series of dots, is
not affected by the action of the anti-clut-
ter rain circuitry. Note that Racon re-
sponses, which are often in the from of a
long flash, will be affected by the use of
this control.
Some sets have automatic/manual anti-
clutter rain control facilities in which case
the operator should switch to manual.
Note: This SART information is excerpted
from IMO SN/Circ 197 Operation of Ma-
rine Radar for SART Detection.
3.4 RACON (Radar Beacon)
A racon is a radar transponder which emits
a characteristic signal when triggered by
a ship's radar (usually only the 3 centime-
ter band). The signal may be emitted on
the same frequency as that of the trigger-
ing radar, in which case it is superimposed
on the ship's radar display automatically.
The racon signal appears on the PPI as a
radial line originating at a point just beyond
the position of the radar beacon or as a
Morse code signal (figure below) displayed
redially from just beyond the beacon.