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Simrad PI has a variety of sensors：

Simrad PI Bottom Contact：Mounted on a bottom trawl,pelagic trawl or purse seine, this sensor will tell you if the gear touches the bottom, or lifts off.

Simrad PI Catch：This is your “eye” at the cod-end.With this sensor in use, you can easily monitor the filling rate and the amount of catch in the trawl.

Simrad PI Depth：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.Use this sensor to monitor and hold the desired depth.

Simrad PI Geometry：Check the geometry of your bottom trawl, pelagic trawl and danish seine. This is achieved by making accurate measurements
of the distances between the centre of the headrope (or footrope) and each of the trawl doors or wing ends.

Simrad PI Height：With a built-in echo sounder, this new PI sensor will always tell you the exact distance to the bottom or the footrope.

Simrad PI Rip：This sensor allows you to monitor if your net is damaged.

Simrad PI SeineSounder：From its position on the gear, this dual sensor measures both the depth below the surface and the height above the bottom.

Simrad PI Spread：Used on bottom and pelagic trawls the PI Spread sensor provides crucial information about your trawl behaviour. It tells you the exact
distance between the trawl doors.

Simrad PI Spread/Depth：This dual sensor measures the physical distance between the trawl doors as well as the depth of the trawl door.

Simrad PI Temperature：This sensor measures the water temperature. Fishing in too warm or too cold water may be just a waste of time and money.

Simrad PI Twin Spread：Used on twin trawls the Twin Spread and Remote
sensors provide crucial information about your trawl behaviour. The three sensors working together tell you the exact distance between the twopairs of trawl doors.

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