Installation manual

Simrad PI54
52
851-165187 / Rev.A
Figure 1 Horizontal
coverage area
The illustration shows a hydrophone installed at an angle of 70
degrees to the vessel’s center line.
(A) = The PI54 hydrophone
(B) = The horizontal coverage area
Vertical coverage area
The hydrophone has a vertical beam width of -30_ and should
be tilted so that the most important part of the seine is
adequately covered. Tilt should be no less t han -15_ in most
instances with the optimal tilt angle depending on the size
(length/depth) of the seine in use. Heeling of the vessel after the
seine is set must also be taken into consideration. For a large
purse seine (about 1000m or longer) the recommend a tilt angle
is -15_ plus the estimated angle of heel when the net is set. For
smaller and deeper seines it may be necessary to increase the tilt
angle.