Prerequisites
For accurate location of the ship dimensions, you need the detailed vessel drawings. Neither tools nor instruments are required. The CS90 is turned on, and it is working normally.
Context
It 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.