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Samples of three GPS satellites' orbits over a five-year period (2013 to 2018) USA-242 · USA-239 · USA-151 · Earth As of 15 August 2023, 83 Global Positioning System navigation satellites have been built: 31 are launched and operational, 4 are unhealthy or in reserve, 41 are retired, 2 were lost during launch, and 1 prototype was never launched. 4 Block III satellites have completed ...
The Global Positioning System ( GPS ), originally Navstar GPS, [2] is a satellite-based radio navigation system owned by the United States government and operated by the United States Space Force. [3] It is one of the global navigation satellite systems (GNSS) that provide geolocation and time information to a GPS receiver anywhere on or near ...
An electronic navigational chart ( ENC) is an official database created by a national hydrographic office for use with an Electronic Chart Display and Information System ( ECDIS ). [1] ECDIS and ENCs are the primary means of electronic navigation on cargo ships. [1] Charts can be used in navigation to provide an indication of location once a ...
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Satellite navigation is a system that uses satellites to provide geolocation and time information to a receiver on Earth. GNSS is a term that refers to the global navigation satellite systems that operate worldwide, such as GPS, GLONASS, Galileo and BeiDou. Learn more about the history, technology and applications of satellite navigation from this Wikipedia article.
Navigational database. A navigational database is a type of database in which records or objects are found primarily by following references from other objects. The term was popularized by the title of Charles Bachman 's 1973 Turing Award paper, The Programmer as Navigator. [1] This paper emphasized the fact that the new disk-based database ...
t. e. The Indian Regional Navigation Satellite System ( IRNSS ), with an operational name of NavIC (acronym for Navigation with Indian Constellation; also, nāvik 'sailor' or 'navigator' in Indian languages), [2] is an autonomous regional satellite navigation system that provides accurate real-time positioning and timing services. [3]
Equatorial stars[edit] Equatorial stars of the eastern hemisphere. The equatorial region of the celestial sphere's eastern hemisphere includes 17 navigational stars from Alpheratz in the constellation Andromeda to Denebola in Leo. It also includes stars from the constellations Cetus, Aries, Taurus, Orion, Canis Major and Minor, Gemini, and Hydra.