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2. DESCRIPTION OF RADAR
2-5
2.2.4 Shadow sector
Funnels, stacks, masts, or derricks near the antenna interrupt the radar beam, and a
non-detecting sector can occur. Radar can not detect targets within this sector.
2.3 SART (Search and Rescue Transponder)
2.3.1 SART description
A Search and Rescue Transponder (SART) responds to any X-band (3 cm) radar with-
in a range of approximately 8 nm. Each radar pulse received causes the SART to
transmit a response which is swept continuously across the complete radar frequency
band.
Wharf and its echo
Large ship
Size of blind sector depends
on size of obstruction and range.
Radar position
Radar position
Wharf and its echo
Shadow sector occurs
because obstruction
(like mast) is in path
of radar beam.
Shadow sector
occurs because
wharf is hidden
behind ship.
Radar antenna
beamwidth
Screen A: When SART is distant
Screen B: When SART is close
Echo from SART
Position of
SART
Your ship
position
Your ship
position
SART mark
length
24 NM
1.5 NM
Position of
SART
Echo from
SART
Lines of 12 dots are displayed in
concentric arcs.