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6. RADAR
6-22
6.25.2 Search and rescue transponder (SART)
A ship in distress uses a radar-SART to show a series of dots on the radar display of
nearby ships to indicate distress. A SART transmits when it receives a radar pulse
from any X-Band (3 cm) radar within a range of approximately 8 nm. When a SART
receives a radar pulse, the SART transmits a response across all the radar frequency
band.
How to detect the SART response
Use the range scale of 6 or 12 NM. The distance between the SART responses is
approximately 0.6 NM (1125 m) to identify the SART.
Turn off all the automatic clutter filters.
Turn off the interference rejector.
Racon (Radar Beacon)
A racon is a radar transponder that sends a characteristic signal when the racon re-
ceives a radar pulse (normally only the three-centimeter band). If the racon signal is
sent on the same frequency as that of the radar, the signal appears on the radar dis-
play. The racon signal appears on the radar in one of two methods:
A line that starts just after the position of the Racon
A Morse code signal displayed with a line just after the position of the Racon
Radar antenna beamwidth
Screen A: When SART is distant
Screen B: When SART is close
Position of
SART
24 NM
1.5 NM
Own ship position
Own ship position
Echo from SART
(Lines of 12 dots
are displayed in
concentric arcs.)
Own ship position
Own ship position
Position of
SART
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