Added areas 3398-3401, UoM 9096-98, ellipsoid 7055, datum 6748, geogCRS 4748, proj method 9833, CS 4533, proj 19878-80, projCRSs 3139-43, tfm 15875-78. Deprecated datum 6731, CRS 4731 and tfm 15821 and added replacements 6752, 4752 and 15897. For datum 6720 amended name, scope and info source; added alias, origin description and remarks. For datum 6721 amended area of use code, remarks and info source. For CRS 4720 amended scope, remarks and info source; added alias. For CRS 4721 amended area of use code, scope, remarks and info source. For area 1094, added names of groups adjacent to main islands to area of use.