Installation manual

Simrad PI54
50
851-165187 / Rev.A
Optimal location of purse seine
hydrophones
The most influential f actors effecting hydrophone reception
common to most vess e ls are:
• Nois e from cavitation generated by the main propeller.
• Air bubbles in the water around the hydrophone which
impede acoustic signals.
• Noise from other acoustic equipment mounted in close
proximity.
Taking these main sources of disturbance into consideration, the
generally r ecommended location for mounting a single
hydrophone is appr oximately one third the vessel’s water-line
length from t he bow.
Installations requiring the use of two hydrophones m ay position
the first as described above and the second fo rward of the bow
thruster in conjunction with the transducer shoe for the echo
sounder. Both hydrophones must be located at least four meters
from the bow thruster.
Optimal hydrophone placement differs from vessel to vessel.
Variables effecting hydrophone performance must be understood
so that the best location may be chosen given a vessel’s design
and particular operation.
The illustration shows the recommended fore (B) and aft (A)
locations for single hydrophone locations. For a dual
installation, both are used. (L) is the total length of the hull
measured at the waterline.