Other changes include changes to the validity of medical certificates. The previous three-month validity requirement has been replaced by the requirement that crew medical certificates must be valid at the time of the crew member`s accession to the ship and remain valid for the duration of service. In addition, the revised agreement introduces an option for the parties to agree on a higher level of health than that required by the flag State. BIMCO is adapting the SHIPMAN 2009 agreement currently used for the use of autonomous vessels, but the absence of real autonomous vessels currently in service will require ongoing adjustments, as the industry advances its breakthrough plans. The release of the first version is scheduled for 2021. 1. .