GlobalFix V5 Cat 1 GPS AIS EPIRB with Return Link Service Mobile AppThe ACR GlobalFix V5 EPIRB combines 406 MHz satellite connectivity with Automatic Identification System AIS functionality. This means that when the EPIRB is activated not only does it transmit your emergency signal to the global Cospas Sarsat satellite rescue system, but it broadcasts an AIS safety message on VHF-frequencies that can be seen immediately by any AIS-equipped vessel nearby. Other great features include Return Link