GNSS

Global Navigation Satellite System is the collective term for any satellite-based positioning and navigation system that provides position, velocity, and time data to receivers anywhere on or near the Earth. The most widely known GNSS is GPS (Global Positioning System), operated by the United States. Other systems include GLONASS (Russia), Galileo (European Union), BeiDou (China), and regional augmentation systems such as SBAS (Satellite-Based Augmentation Systems, including WAAS in North America and EGNOS in Europe). Modern aviation receivers often use signals from multiple constellations simultaneously to improve accuracy and reliability. In aviation, GNSS has transformed navigation by providing a continuous, accurate position fix without relying on ground-based radio navaids. It underpins RNAV (Area Navigation) and RNP (Required Navigation Performance) operations, allowing aircraft to fly precise routes between any two geographic points rather than being constrained to airways defined by VOR or NDB stations. GNSS also enables RNAV instrument approaches, including LPV (Localizer Performance with Vertical guidance) approaches that provide ILS-like vertical guidance at airports without ILS equipment. Augmentation systems like SBAS and GBAS (Ground-Based Augmentation System) further enhance GNSS accuracy and integrity to meet the most demanding approach categories.

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In Virtual Airline Operations

GNSS is the backbone of navigation in flight simulation. All modern flight simulator aircraft use GPS/GNSS data for position, and the FMS relies on it to sequence waypoints, provide LNAV/VNAV guidance, and execute RNAV approaches. Virtual pilots flying on VATSIM should be familiar with RNP and RNAV procedures, as many modern SIDs, STARs, and approaches at Canadian and international airports are GNSS-based.

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Related Terms

• FMS - Flight Management System
• ADS-B - Automatic Dependent Surveillance-Broadcast
• FMC-FMGC - Flight Management Computer/Flight Management Guidance Computer