United States. Civil Aeronautics Board. Bureau of Air Operations, Routes Division. North Decimal Degree 90.000000. South Decimal Degree -90.0000. East Decimal Degree 180.0000. West Decimal Degree -180.0000. Ancillary mapw: Caribbean area.; Dominican Republic, Puerto Rico, and Virgin Islands; Hawaiian Islands. "Routes shown on this map do not necessarily conform to air tracks of actual operation.".