The deadline for submission of official working documents to the 77th GRE session is 9 January 2017.
21. The expert from Poland, in his capacity of Chair of the Informal Working Group on Visibility, Glare and Levelling (IWG VGL), reported on the IWG activities (GRE-77-27). GRE noted that, at its next session, it should take a decision to extend the mandate of IWG VGL.