Definition
A reference station at a surveyed position computes the error in each satellite range and broadcasts corrections in RTCM format, historically over marine radiobeacons in the 283.5 to 325 kHz band. A vessel within a few hundred miles applies them and typically achieves accuracy of one to three metres, degrading with distance from the station. Many national authorities have withdrawn or reduced their radiobeacon services as SBAS coverage has matured.
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