2-7
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-clutter rain
circuitry. Note that Racon responses, which are often in the form 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 Marine
Radar for SART Detection.
2.4 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 centimeter band). The signal may be emitted on the same
frequency as that of the triggering 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 radially
from just beyond the beacon.
Racon
Figure 2-9 Appearance of RACON signal on the radar display
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