Indoor GPS is a Geolocaliszation that woks indoor
- emitters emit waves that penetrate indoor such as MW or FM
- these waves carry a synchonised emission time, and their place of emission
- receivers listen to at least three different emitters
- and deduct their own location
by verifying anbd registering the delivery place
by gelocalising the cash terminal
by gelocalising the receiving payment terminal
by gelocalsing them and srcambling wrong signals
monitors will scramble any sucessor to a wrong signal
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