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We discuss how the location information provided by GPS can be used at different layers of the protocol stack of a mobile host. Our discussion focuses an application of the two GPS based networking protocols we have designed and implemented. The network topology we are considering is composed of fixed Internet with base station at the edges connected with an ad hoc networks of mobile nodes that are connecting information from sensors spread through a region. In the network, base stations and mobile nodes are GPS equipped. The idea is to leverage the information of the mobile and base station positions, obtained via the GPS, to improve performance of the ad hoc routing, to adaptively determine the appropriate base station capacity to be reserved strictly for handoffs, to collect data from sensors scattered in the medium and to inform mobiles about the prospective future location.