Abstract: Systems and methods for facilitating a first response mission at an incident scene, such as an accident site, a natural or human-made disaster site, or any other first response site. One system is for locating a plurality of portable modules at an incident scene. The system comprises a plurality of receivers transportable to the incident scene. The system also comprises a processing entity configured to: determine a location of a first one of the portable modules based on first data derived from a wireless signal transmitted by the first one of the portable modules and received by at least three receivers of the plurality of receivers; and determine a location of a second one of the portable modules based on the location of the first one of the portable modules and second data derived from a wireless signal transmitted by the second one of the portable modules and received by the first one of the portable modules.