A method for determining the position of a mobile or asset in an indoor location, the method comprising: generating a Wi-Fi multi-band fingerprint database (309) using at least one multi-band Wi-Fi access point (303) configured to simultaneously transmit multiple frequency band wireless signals; selecting, from the multiple frequency band wireless signals transmitted by each WiFi access point, a most probable frequency band having the highest probability function for a target location of the mobile or asset (307); selecting one or more fingerprints from the Wi-Fi multi-band fingerprint database in dependence on the selected frequency band and selecting a measured signal that is needed to determine the location (308); and comparing the selected measured signal and the selected one or more fingerprints to determine the location of the measured signal (310, 311).
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