Anyone who attaches or detaches loads or loose gear to lifting devices.
Source: API RP 2D, Operation and Maintenance of Offshore Cranes, Seventh Edition, December 2014. Global Standards
A rigger is anyone who attaches or detaches lifting equipment to loads or lifting devices. In order to be considered a Qualified Rigger, the person shall have successfully completed a rigger-training program in accordance with Appendix A3. The minimum requirements for a Qualified Rigger are outlined in detail in 3.1.4 and Appendix A3. A Qualified Crane Operator is also a Qualified Rigger. Riggers will remain qualified provided they successfully complete the refresher training requirements outlined in 3.1.4.
Source: API RP 2D, Operation and Maintenance of Offshore Cranes, Sixth Edition, May 2007. Global Standards