Geographic names. Tariffs should employ locations (points) that are published in the National Imagery and Mapping Agency (NIMA) gazetteer or the Geographic Names Information System (GNIS) developed by the U.S. Geological Survey. Ports published or approved for publication in the World Port Index (Pub. No. 150) should also be used in tariffs. Tariff publishers may use geographic names that are currently in use and have not yet been included in these publications.