Following the approval of the ITU Handbook on Spectrum Monitoring (Edition 2011)@ it became apparent that Radiocommunication Study Group 1 should issue a Recommendation on the characteristics and functions of mobile spectrum monitoring covering the relevant information contained in the ITU Handbook on Spectrum Monitoring (Edition 2011)@ and ITU-R Recommendations. This Recommendation will facilitate the way in which administrations set up radio mobile monitoring systems on their national territories.