An inventory control system is disclosed. The system includes a plurality of inventory item storage locations, an access system for controlling access to the inventory items, where the access system includes an input device for entering the identity of a user, a monitoring system for monitoring the removal and replacement of the inventory items from the storage locations, at least one locatable device that is arranged to be carried by a user of the inventory control system and that is locatable by a positioning system, a positioning system, arranged to determine the location of the locatable device, and a data processing system for recording the removal and replacement of inventory items and location data received from the positioning system such that the movement of the or each locatable device can be tracked.