Operation Manual

Simrad PI54
74
850-165186 / Rev.B
Only twin trawl Alpha (port) is shown.
(P) = Port trawl
(S) = Starboard trawl
(C) = Port trawl door with the Twin Spread 1 sensor mounted.
(D) = Centre clump with Remote 1 mounted.
(E) = Starboard trawl door with Remote 3 mounted.
(F) = Forward
(1) = Distance between port trawl door and centre clump,
measured direcly by the Twin Spread sensor.
(2) = Distance between the centre clump and the starboard
trawl door, must be calculated by the PI54 system.
Placing the sensors on the trawl
The two twin trawls are referred to as Alpha (port) and Bravo
(starboard).
On the twin trawl Alpha, the Twin Spread 1 sensor must be
mounted on the port t rawl door, and the three communication
transducers on the sensor must not be obstructed.
Remote 1 is placed on the centre clump of Alpha.
Remote 3 is placed on the starboard door of Alpha.