Search And Rescue Transponder (Sart); Racon (Radar Beacon) - Furuno NAVnet TZtouch2 Operator's Manual

6.28.2

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.
Screen A: When SART is distant
Radar antenna beamwidth
Own ship position Own ship position
24 NM
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.
6.28.3

RACON (Radar Beacon)

A RACON is a radar transponder that sends a characteristic signal when the RACON
receives 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
display. 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
Echo from SART
(Lines of 12 dots
are displayed in
concentric arcs.)
Position of
SART
Screen B: When SART is close
Own ship position Own ship position
1.5 NM
6. RADAR
Position of
SART
6-39