Operation Manual

Simrad PI54
22
850-165186 / Rev.B
Depth: How deep can you go?
When the sonar and echo sounder tell you how deep the school
goes, it is good to know that you can place your fishing gear at
the same depth. And even better, you can monitor and hold the
desired depth. The design is rugged and awardwinning, and the
sensor is available for three different depth ranges.
The PI Depth sensor provides i nformation about the current
depth and the depth changes of your gear.
• Bottom trawl: On a bottom trawl, you will use the sensor to
achieve full control when shooting, and to position the trawl
on the slope.
• Pelagic trawl: During pelagic trawling, you know how
important it is to position the trawl relative to the largest
concentration of fish. By using a Depth sensor, you can
monitor the exact depth relative to the surface, and adjust the
trawl depth accordingly. Additional depth sensors on the
doors will monitor if the doors stay at the same depth.
• Purse seine: During seining, use the Depth sensor to monitor
the depth of the net, and the descending speed of the net.
Then you will know when to start pursing, and which speed
to use.
• Danish seine: Mounted on a Danish Seine the Depth sensor
monitors the sinking speed of the net, and it will tell you
when to start hauling once the net has stopped sinking.
Height sensor: Accurate distance to the bottom!
With a built-in echo sounder, this new PI sensor is full of
advanced technology. Wherever you place it, it will always tell
you the exact distance to the bottom.
The height sensor measures the height over the bottom, that is
the distance from the bottom and up to wherever the sensor is
located. This provides you with a valuable range of applications
for bottom and pelagic t rawling.
• Bottom trawl: Place the sensor behind the headrope, and it
will tell you the height of the trawl opening. This allows you
to adjust you equipment immediately if the opening is
reduced, and you will avoid loosing catch.
• Pelagic trawl: With a height sensor behind the footrope you
will know at once if the trawl approaches the bottom. If you
use a second sensor behind the headrope, the difference
between the two measurements will give you the height of
the trawl opening.