Guernsey has the official ISO 3166 - 1 alpha - 2 code GG .
The official ISO 3166 - 1 alpha - 3 code GGY ; market data vendors , such as Reuters , will report products related to GG using the alpha - 3 code .
Guernsey has the official ISO 3166 - 1 alpha - 2 code GG and the official ISO 3166 - 1 alpha - 3 code GGY ; market data vendors , such as Reuters , will report products related to Guernsey using the alpha - 3 code .