Shadow Sector; Sart (Search And Rescue Transponder); Sart Description - Furuno FR-8045 Operator's Manual

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.
Radar position
Large ship
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.
Screen A: When SART is distant
Echo from SART
24 NM
Position of
SART
Wharf and its echo
Shadow sector
occurs because
wharf is hidden
behind ship.
Radar antenna
beamwidth
Your ship
position
SART mark
length
Radar position
Size of blind sector depends
on size of obstruction and range.
Screen B: When SART is close
Lines of 12 dots are displayed in
concentric arcs.
1.5 NM
Your ship
position
2. DESCRIPTION OF RADAR
Wharf and its echo
Shadow sector occurs
because obstruction
(like mast) is in path
of radar beam.
Echo from
SART
Position of
SART
2-5