Compact Satellite Communicator Click HERE for more information! Small, rugged, lightweight satellite communicator enables 2 way text messaging using the 100 percentage global Iridium network (satellite subscription required).Special Feature:Bluetooth. Trigger an interactive SOS to the 24/7 search and rescue monitoring center (satellite subscription required). Display size-0.9 x 0.9 inch Access downloadable maps, U.S. NOAA charts, color aerial imagery and more by using the free Garmin Earthmate app and compatible devices