Look into the Garmin Rhino system of GPSes, it was designed in conjunction with SAR teams and can report your location to other Rhino units. There is also a base-station style thing I believe (or it hooks into a computer not sure). From what I remember you are able to set locations and what not on the map for others to see. It would probably cost a pretty penny to set up, but a team would be able to make use of it. Also, the Rhino units have GMRS/FRS ability which makes it doubly useful.
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