ENC is an acronym for Electronic Navigational Chart, a specialized type of digital chart used by seafarers for navigation. Synonyms for ENC include chart, map, blueprint, plan, diagram, and topographical map. In addition, there are many software programs that can be used to view and manipulate ENC data, such as ESRI's ArcGIS and CARIS' HIPS and SIPS. Other commonly used navigation tools besides ENC include global positioning systems (GPS) and radar. While traditional paper charts are still used for some navigational purposes, the use of ENC has become increasingly common due to its accuracy, ease of use, and ability to be updated in real-time.