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Fingerprinting is a popular technology for 802.11based positioning systems: Radio characteristics from different access points are measured at various positions and stored in a database. The database is copied to all mobile devices, and when a position is needed, the devices compares its currently measured radio characteristics with the database entries. In this paper, we present two on-demand fingerprint selection algorithms to avoid the cumbersome and time-consuming approach of manuallydoi:10.1109/wowmom.2008.4594839 dblp:conf/wowmom/KingHE08 fatcat:lckwqmipy5efflch5nxdg4r4hu