An apparatus comprising a processor and memory, the memory including computer program code, wherein the memory and computer program code are configured to, with the processor, cause the apparatus to: - receive geographic location signalling associated with the geographical location of one or more white-space devices; - receive uncertainty indication signalling for the uncertainty associated with the respective geographic location of the one or more white-space devices, wherein the uncertainty indication signalling is indicative of an uncertainty area, within which the respective white-space device may be located according to the errors associated with the way in which the respective geographical location of the one or more white-space devices is determined; and - determine the one or more channels available for use by the respective one or more white-space devices in the respective geographical location by using the geographic location signalling, the uncertainty indication signalling, and channel availability data, wherein the channel availability data is configured to indicate the one or more channels available for white-space communication within respective geographical sub-regions of a geographical region, characterised in that the apparatus is configured to determine the one or more channels available for use by the respective one or more white-space devices in the respective geographical location, by being configured to: determine the different respective sub-regions which are at least partially overlapped by the uncertainty area associated with the one or more determined white-space device locations; and identify the channels available for use by the one or more white-space devices based on the common channels available for use within the different respective sub-regions which are at least partially overlapped by the uncertainty area. - receive geographic location signalling associated with the geographical location of one or more white-space devices; - receive uncertainty indication signalling for the uncertainty associated with the respective geographic location of the one or more white-space devices, wherein the uncertainty indication signalling is indicative of an uncertainty area, within which the respective white-space device may be located according to the errors associated with the way in which the respective geographical location of the one or more white-space devices is determined; and - determine the one or more channels available for use by the respective one or more white-space devices in the respective geographical location by using the geographic location signalling, the uncertainty indication signalling, and channel availability data, wherein the channel availability data is configured to indicate the one or more channels available for white-space communication within respective geographical sub-regions of a geographical region, characterised in that the apparatus is configured to determine the one or more channels available for use by the respective one or more white-space devices in the respective geographical location, by being configured to: determine the different respective sub-regions which are at least partially overlapped by the uncertainty area associated with the one or more determined white-space device locations; and identify the channels available for use by the one or more white-space devices based on the common channels available for use within the different respective sub-regions which are at least partially overlapped by the uncertainty area. determine the different respective sub-regions which are at least partially overlapped by the uncertainty area associated with the one or more determined white-space device locations; and identify the channels available for use by the one or more white-space devices based on the common channels available for use within the different respective sub-regions which are at least partially overlapped by the uncertainty area.