Requesting Regulation 13 Certificates Geoscience Australia provides a free service to obtain Regulation 13 Certificates on your survey marks which are normally Continuously Operating Reference Stations (CORS). For a CORS to be considered for Regulation 13 certification it must be accepted as a participant in the Asia Pacific Reference Frame (APREF) project. The guidelines for becoming an APREF participant can be found here. Note that only the CORS site owner can submit the application for Regulation 13 Certification unless a signed consent letter is issued by the CORS owner for a secondary party to submit on their behalf. http://www.ga.gov.au/scientific-topics/positioning-navigation/geodesy/re...