Operation Manual

Simrad PI54

850-165186 / Rev.B

Bottom trawl

When used f or bottom t rawling, the PI54 system will give you

all necessary info rmation about the trawl status. You should

have minimum three of the following sensors attached to the

net: Depth sensors(s), Bottom Contact sensor, Rip sensor and

Catch sensors(s).

The system is designed to be used with up to six sensors. We

recommend that you use a Bottom Contact sensor behind the

footrope, a Height sensor behind the headrope, two Catch

sensors, a Temperature sensor and a Spread sensor. Sensor

configuration can be tailored to suite individual needs.

(A) = Depth sensor (headrope)

(B) = Depth sensor (footrope)

(D) = Rip sensor

(E) = (F) = Catch sensor(s)

Using the r ecommended sensors, the PI54 system will provide

the following information:

• Optimal vessel speed with regard to net sink rate and bottom

approximation.

• When the codend is full.

• Footwire/bottom lift-off.

• Net opening (using two depth sensors) and damage