Context
Use the Ship page with the ship's physical dimensions to create a virtual reference point (the Ship Origin) in a dedicated coordinate system for the SN90 system. The Ship Origin is normally located in the following position:
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X position: Half the ship's length |
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Y position: Half the ship's width |
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Z position: On the waterline |
If you want to change the location of the Ship Origin, you can do this by providing offset values in the X, Y and/or Z directions. To do this you will need the ship drawings.
TipIt is common practice to place the Ship Origin at the same position as the motion reference unit (MRU). This will minimize the vectors when your vessel is moving. Use the vessel drawings to establish the offset values between the basic position of the Ship Origin and the MRU location.
If you do not have a motion sensor you can place the Ship Origin at any location on the vessel. We suggest that you place the origin under the captain’s seat on the bridge. All sensors will then be referenced to this position. Whenever a sonar is used with short ranges, this will provide a more precise presentation.
Further requirements
You must proceed by defining the locations of the navigation system antenna, the motion reference sensor, and the transducer.
These locations are all referenced to the same reference point.