The emergency call is a standard scenario used to illustrate the delivery of high-value location based services to a mobile phone user. Suppose a person with a mobile phone is injured when their car slides off an icy road into a ditch at night. This scenario reflects the essence of systems that are standard equipment on millions of new cars in North America.
The injured person presses a "panic button". This sends a special message to a special kind of MSP: an Emergency Service Provider. (In many places this is the Public Service Answering, or Access Point or PSAP.) The Emergency Service Provider uses an NSP to locate the injured person and direct help toward that location.
A second common scenario is when a mobile person wants to rendezvous with one or more "buddies" who may also be mobile at the same time. The task is to first determine network and geographic presencedetermine which of the buddies are nearby and connected and then guide them to a single location.
Finally, mobile people with mobile phones are a huge resource for improving the navigable models maintained by the NSPs. In many cases the NSP can ask a simple application on the mobile phone to provide simple updates to attributes of real-world entities such as streets and buildings.
Updating the navigable world model