A method, comprising: - obtaining one or more pieces of fingerprint information at least indicative of one or more identifiers of one or more radio nodes ; - obtaining one or more pieces of metrics information, wherein each piece of metrics information of the one or more pieces of metrics information is at least indicative of a trustworthiness associated with a respective piece of fingerprint information of the one or more pieces of fingerprint information, wherein the respective piece of metrics information of the one or more pieces of metrics information is determined to comprise or represent a rank that is assigned to a collector that has gathered a respective piece of fingerprint information of the one or more pieces of fingerprint information; - comparing one or more pieces of fingerprint information gathered by a respective collector to one or more pieces of fingerprint information gathered by one or more other collectors, wherein the rank of the respective collector is increased in case of one or more matches between the one or more pieces of fingerprint information, and wherein the rank of a respective collector is decreased in case of one or more mismatches between the compared one or more pieces of fingerprint information; and - generating a radio map at least partially based on the one or more pieces of fingerprint information and the one or more pieces of metrics information, wherein the trustworthiness associated with the one or more pieces of fingerprint information determines whether or not a respective piece of fingerprint information of the one or more pieces of fingerprint information is used in the generating of the radio map. - obtaining one or more pieces of fingerprint information at least indicative of one or more identifiers of one or more radio nodes ; - obtaining one or more pieces of metrics information, wherein each piece of metrics information of the one or more pieces of metrics information is at least indicative of a trustworthiness associated with a respective piece of fingerprint information of the one or more pieces of fingerprint information, wherein the respective piece of metrics information of the one or more pieces of metrics information is determined to comprise or represent a rank that is assigned to a collector that has gathered a respective piece of fingerprint information of the one or more pieces of fingerprint information; - comparing one or more pieces of fingerprint information gathered by a respective collector to one or more pieces of fingerprint information gathered by one or more other collectors, wherein the rank of the respective collector is increased in case of one or more matches between the one or more pieces of fingerprint information, and wherein the rank of a respective collector is decreased in case of one or more mismatches between the compared one or more pieces of fingerprint information; and - generating a radio map at least partially based on the one or more pieces of fingerprint information and the one or more pieces of metrics information, wherein the trustworthiness associated with the one or more pieces of fingerprint information determines whether or not a respective piece of fingerprint information of the one or more pieces of fingerprint information is used in the generating of the radio map. <EOS>