Prerequisites
For accurate location of the transducer, you need the detailed vessel drawings. You also need the alignment angle that was recorded when the hull unit was installed. Neither tools nor instruments are required. The ME70 system is turned on and operates normally.
NoteDetermining the relative positions and orientations of the sensors and each transducer with high accuracy is important. This requires professional land surveying done by qualified and trained surveyors using proven survey equipment and methods. We recommend that you use third-party consultants with well proven experience with vessel dimensional control. The information provided by the dimensional survey is entered into the ME70 software as installation parameters.
Context
The physical location and the installation angles of the transducer are critical for the echo data accuracy.
Use the centre of the transducer face as reference, and define the offset values related to the Ship Origin. The installation angles relevant for the transducer must also be defined. These values were recorded during the installation, and they define the direction of the transducer face.
NoteThe required accuracy of the offset and rotation angles depends on the accuracy requirements for the echo data. It is very important that the transducer installation angles are measured and recorded accurately during the installation. These angles must be accurately defined in the operating software. Incorrect angles will greatly reduce the data accuracy.