Since the location of this smartcard wireless device can be tracked in the airport by normal wireless antenna location means, by GPS, or by direction fixing between multiple antennas, or any other tracking means, {HEAD ~ the approximate location} of {TAIL ~ the person} is known at all times while in any area of the airport or building 
Since the location of this smartcard wireless device can be tracked in the airport by normal wireless antenna location means , by GPS , or by direction fixing between multiple antennas , or any other tracking means , { HEAD ~ the approximate location } of { TAIL ~ the person } is known at all times while in any area of the airport or building
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