While you may not get a GPS location (and I have no idea how that will work with the latest high sensitivity GPS chips in the new PLBs), our experience in testing is that the 5-watt 406 MHz signal will get out, bouncing off the walls, and that a alert and Doppler location will be provided. Combined with a good trip plan left with your emergency contacts or in the Additional Information field on the NOAA registration site, that should suffice to get you rescued.