There are 7 coordinate systems (thus far) used in reference to HAM6,
- OMCS Euler Control Basis
- OPOS Euler Contorl Basis
- OMCS OSEM Basis
- OPOS OSEM BASIS
- OMC Cavity Waist Basis
- ISI GS13 Sensor Basis
- SYS Global / ISI Local Cartesian Basis
- The OMC DCPD Sensor Basis
- The OMC QPD Sensor Basis
This diagram serves to show how they're all related.