This paper is about a tour guide which finds your location on the map (gps locator) and provides information about the nearest buildings to you. Also there is a discrimination between indoor(if you are in a mall) and outdoor locations. Moreover, there are some screenshots from the prototype app which may be useful.
Available at: http://condor.depaul.edu/dmumaugh/readings/handouts/SE430/p421-abowd-97.pdf