Many SimConnect variables such as EYEPOINT POSITION
are given relative to aircraft's datum reference position, but SimConnect does not expose it. The position is usually (0.0, 0.0, 0.0), but there are notable exceptions like the default 747-8, which has refpoint at (83.5, 0.0, 0.0).
Please add a SIMCONNECT_DATA_XYZ
type variable to expose reference datum position.