Geostationary orbit
Navigation

Geostationary satellites can be used to augment GNSS systems by relaying clock, ephemeris and ionospheric error corrections (calculated from ground stations of a known position) and providing an additional reference signal. This improves position accuracy from approximately 5m to 1m or less.

Past and current navigation systems that use geostationary satellites include:
detectable_content:number_placeholders[7], language:response_language[Latin]