These two object representations, of the path and the position along that path, give the general position of the moving feature. The other variable in describing the position of the feature is the rotation about the chosen reference point. To describe this, a local engineering coordinate system is established using the object reference point as its origin. The geometry of the feature is described in the engineering coordinate system and the real-world orientation of the feature is given by mapping of the local coordinate axes to the global coordinate system (the CRS of the trajectory of the reference point). This can be given as a matrix that maps the unit vectors of the local coordinate system to vectors in the global CRS.
If the global CRS and local CRS have the same dimension, then each point within the local CRS can be traced in time through the global CRS by combinations of these various mappings. The map would trace from time (t) to the measure (m) to a position on the reference point's path using the LRS. Then using the rotation matrix, the calculated offset from this point gives a direct position in the global CRS.