The rapid development of differential GNSS transmissions via low-frequency maritime
radiobeacons has further increased the occupancy of an already over-crowded frequency
band. This has resulted in interference between stations, with consequent reductions of
coverage. The paper suggests a re-allocation of channels within this band in Europe to be
carried out, taking careful account of the known groundwave and skywave propagation of
both wanted and interfering signals and the distribution of atmospheric noise. A novel
algorithm is proposed for re-allocating frequencies. The resulting band plan is shown to offer
substantially increased coverage for DGNSS radiobeacons while preserving the performance
of marine and aeronautical direction-finding beacons, the latter remaining on their original
channels.