Dead reckoning using proximity sensors

A method (700) comprising: collecting (710) proximity data using a plurality of proximity sensors (120) from a mobile device (100); determining (720) a position of the mobile device relative to a user (530) of the mobile device, the position determined using proximity data; determining (730) a first location of the mobile device by an absolute location measurement; select a maximum allowed time period from a plurality of maximum allowed time periods, based on the position of the mobile device relative to the user determined using proximity data, to track the mobile device using a dead calculation technique , wherein the dead calculation technique comprises determining a second location of the mobile device based, at least in part, in information indicative of the movement of the mobile device from the first location; and wherein each of the maximum allowed periods of time is associated with a different position of the mobile device in relation to the user; and track, through the dead count technique, the mobile device for a maximum allowed period of time.