A method of controlling access to a restricted area including receiving location information from at least one supplemental tracking source which tracks location of an authorized user, and controlling access by the authorized user to a restricted area based on the location information. The method may further include maintaining a muster based on the location information. A physical access control system for controlling access to a restricted area including a user location information system and an access system which controls access based on the location information. The user location information system may further maintain a muster based on the location information. The user location information system receives location information indicating location of an authorized user from at least one supplemental tracking source.