US Patent 8233896 Mobile communication units that display connectivity loss boundaries

A mobile communication unit is provided that employs a propagation algorithm to determine connectivity loss boundaries that define connectivity loss regions based on one or more forward projected position vector paths of the mobile communication unit and connectivity data. The mobile communication unit further comprises a map renderer configured to provide map display data that includes the map area data, situational awareness location data and the determined connectivity loss boundaries, and a display configured to display the map display data as a geographical map area with an icon of the mobile communication unit located in a geographic location of the geographical map area and drawn connectivity loss boundaries that define connectivity loss regions in a geographic location of the geographical map area.