Theory of Operation
974-24007001/5.0 1
1 System Familiarization
1.1 Overview
The SIMRAD FS 70 Series is a third wire trawl monitoring system for pelagic and bottom
fishing trawlers. The system provides real time information from the trawl sonar head and
the associated sensors to the bridge, thus maximizing fishing efficiency and reducing sea
time.
The FS 70 vertical trawl sonar allows the operator to see the complete net opening and
operation by displaying individual fish targets in the vertical plane, the fish school location,
bottom/net location and net geometry. In addition to the vertical monitoring, the FS 70 also
allows the operator to measure the spread of the trawl door, view and skim banks to avoid
reefs and locate boulders on the ocean floor that may damage the trawl net.
The 200 kHz Echo Sounder capability ensures maximum control of the foot rope during the
tow. The active motion sensor for pitch and roll comes as a standard feature.
The trawl system’s sensor module and addition of sensors from the Simrad PI family
allows the operator to monitor trawl depth, water temperature and receive information from
the catch sensors, the doors spread sensors, the cod end depth sensor and from the rip or
bottom contact sensor.
The FS Trawl Sonar Series is a modular system. It is operated with ease through direct
access mouse and keyboard operated menus. The major benefit of the third wire trawl sonar
system is that it prevents the loss of communication with the trawl instrumentation as the
vessel is changing course and or during heavy sea.
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