Improved caching of content at caching proxy servers is disclosed. Specifically, embodiments of the present invention compare travel product sales parameters such as, for example, price and sales volume, to averages of comparable sales parameters from stored andor real-time data in order to identify andor display travel products having pricing andor sales volume that differs substantially from comparable average sales parameters. The identification code can be the unique media access code of the wireless access device or any other unique identification code previously registered with the network manager. The disc-shaped media may be sealed within the inner chamber by means of shrink-wrapped plastic, a foil seal or a paperboard seal. A navigation receiver computes the lever arm correction using information from the navigational satellite that allows both the position of the navigational satellite and the navigational receiver to be determined using a known geometry of the steerable spot beam antenna and a prescribed satellite attitude maneuver profile.