The National Pipeline Mapping System is a fully-functional Geographic Information System (GIS). The system contains the location and selected attributes of hazardous liquid and gas transmission pipelines, liquefied natural gas (LNG) plants, and breakout tank farms operating in the United States, including those pipelines that are offshore. The NPMS also contains pipeline operator contact information that is accessible to the public. The NPMS accepts voluntary data submissions for breakout tanks under OPS jurisdiction. Breakout tank submissions are discussed in Section 7.