Defines a geographical reference that you can use to specify distances for input, read positions for output, and view orientation of the model. For example, your design might have a building or a pipe rack that is skewed in relation to the global coordinate system. To make modeling easier, you can create a rotated design coordinate system for that building or pipe rack.

You can place rectangular Cartesian coordinate systems or radial coordinate systems, or you can combine both radial and rectangular planes in a single coordinate system. Both coordinate system shapes are three-dimensional and define points within the space by measuring distances along the X-, Y-, and Z-axes.

There are two types of coordinate systems: the global coordinate system (always a rectangular Cartesian shape) and a design coordinate system (can be either shape).

The software represents each design coordinate system that you place using a triad showing the X-, Y-, and Z-axes (for Ship coordinate systems) or the north (N), east (E), and elevation (EL) axes (for Grids coordinate systems). If you need to place a coordinate system that is rotated about the X- or Y-axes, use the Place Coordinate System by Three Points command instead of this command.

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