Last night I attended training on an emergency tracking system based on APRS and the Norwegian Polaric Trackers and the Polaric portable Map Server. The intention is to give APRS trackers to voluntary search teams and emergency vehicles and provide a detailed map with tracking data to the people in charge of the operation. The system relies on both fixed digipeaters as well as a number of portable digipeaters that can be placed on any suitable hilltop to provide APRS coverage in the area of the emergency. The map server can run offline so you don't really need Internet to show maps and tracking data.
The system is tested in several real life situatons.