The Simrad PI Geometry sensor must be mounted at the exact centre of the headrope (or footrope) with the transducer facing forward. There must be a clear line of sight between the transducer on the PI Geometry sensor and the transducers on the two Mini-R responders. The two Mini-R responders are normally mounted in dedicated adapters on each trawl door, or by other means on the trawl wings
By measuring the distances between the PI Geometry sensor and each of the two Mini-R responders, the sensor system can compare them. The two distances “x” and “y” must have identical length. If the length of “x” or “y” changes, the trawl skewed. The message from the PI Geometry sensor to the PI system on the bridge will provide this information immediately.
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