+proj=longlat +datum=NAD27 +no_defs +ellps=clrk66 +nadgrids=@conus,@alaska,@ntv2_0.gsb,@ntv1_can.dat

Commonwealth of the Northern Mariana Islands

+proj=longlat +datum=NAD83 +no_defs +ellps=GRS80 +towgs84=0,0,0