Abstract
A prototype map-based mobile application is described that allows a user to plan spatio- temporal activities that consist of a sequence of actions. This application utilises an open source web based client-server architecture that can perform spatio-temporal analyses to ensure the planned activity adheres to the spatio-temporal constraints of the planner. The user is able to build these activities by making use of an interactive visual representation which allows the zooming of the map extents based on the potential path area of the user.