DAT uses the international convention of negative longitude values west of the Greenwich Prime Meridian. This may cause nominal conversion hassle for some DAT legacy programs.
The United States and Canada abbreviations are those used by the United States Postal Service and Canada Post, with the exception that we still use pre-2002 codes for Quebec and Newfoundland, for consistency with certain current DAT products and to avoid conflicts with Mexican codes.
NOTE: Mexican state codes do not have an official standard. We use those codes that are in the preponderance of use by North American businesses.