Safe navigation on Baltic Sea needs a backup system for GNSS for continuous and reliable positioning and timing. R-Mode is a cost-efficient system to provide ranging, positioning and timing. Project R-Mode Baltic team will perform fundamental developments and build up a first testbed that utilises maritime radio beacons and AIS base stations. A first coverage prediction of radio beacons and AIS base stations shows the feasibility of the R-Mode approach for Southern Baltic Sea. Requirements on a backup system for GNSS proposed in IALA R-129 will be used for the R-Mode system development.
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