Defining the installation parameters for the transducer
The physical location and the installation angles of the MS70 transducer are critical for the MS70 data accuracy. Incorrect angles will greatly reduce the data accuracy.
Prerequisites
For accurate location of the transducer, you need the detailed vessel drawings. You also need the installation angles that were recorded when the transducer was installed. For maximum accuracy, we strongly recommend that you use the information provided by a dimensional survey.
Note
Determining the relative positions and orientations of the sensors and the 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 MS70 software as installation parameters.
Neither tools nor instruments are required. The MS70 is switched on and working in normal operational mode.
Context
The physical location and the installation angles of the MS70 transducer are critical for the MS70 data accuracy.
Use the centre of the transducer face as reference, and define the offset values related to the Ship Origo. The installation angles relevant for the transducer must also be defined. These values were recorded during the transducer installation, and they define the direction of the transducer face.
Note
The required accuracy of the offset and rotation angles depends on the accuracy requirement for the MS70 data. It is very important that the transducer installation angles are measured and recorded accurately during the installation, and that they are defined accurately in the software. Incorrect angles will greatly reduce the data accuracy.
Procedure
1 Open the Setup menu.
2 On the Setup menu, select Install.
Image
Observe that the Install submenu opens.
3 Select Instrument Offsets to open the dialog box.
4 In the Instrument Offsets dialog box, select Transducer Offset to open the page.
a From the dimensional survey report, extract the relevant information.
b Insert the correct values. Do this as accurately as possible.
c Record the information in the result table.
d Select OK to save the chosen settings and close the dialog box.
Note
The Kongsberg Seapath® - and other GPS systems - allow you to define the transducer location in the positioning system. If this is done, the Transducer X-offset and Transducer Y-offset values in the MS70 must be set to 0 (zero) to avoid "dual compensation". The Transducer Z-offset value must be defined in the MS70. The rotation information is normally not recorded by the positioning system, and must therefore be defined in the MS70.
Result
Transducer offsets
X-offset  
Y-offset  
Z-offset  
Installation angle X (αX)  
Installation angle Y (αY)  
Installation angle Z (αZ)