1. A method of providing location-based information to a requesting user, comprising the steps of: transmitting an access request message from a subscriber unit to one or more receiving sites on a response channel, the access request message comprising an identification number of the subscriber unit; transmitting a forward channel message from a transmitting site to the subscriber unit on a forward channel in response to the access request message, the forward channel message comprising an identification number of the subscriber unit and data defining a time interval for transmission of a response message from the subscriber unit; transmitting a response message comprising an information service request and a location signal to at least three receiving sites in the time interval defined by the forward channel message from the subscriber unit; locating the subscriber unit from the time difference of arrival of the location signal at the receiving sites; generating an information service message in response to the information service request and the location of the subscriber unit, the generating step comprising the steps of creating a database request from the information service request and the subscriber unit location, accessing database information using said subscriber unit location to retrieve selected database information responsive to the database request, the selected database information corresponding to at least one of information relating to the current said subscriber unit location and information relating to selected destinations in the vicinity of the current said subscriber unit location, and processing and combining the selected database information to produce an information service message; and transmitting the information service message to the subscriber unit on the forward channel, the information service message comprising the selected database information and the subscriber unit identification number.