Inmarsat GSPS (or Global Satellite Phone Service) provides phone calling, short messaging (SMS), email-to-text, and 2400 bps data over much of the world excluding the polar caps. Other Inmarsat solutions such as BGAN are available if high speed internet is required. Outfitter Satellite generally recommends GSPS for users operating between 50° N and 50° S latitude in flat or hilly terrain but not extremely mountainous terrain. The main benefit of GSPS over other mobile satellite services is the ability to make long duration calls without unexpected call drops. The IsatPhone 2 is the workhorse of the Inmarsat GSPS network. Here are some of its advanced features:
The Inmarsat GSPS coverage area uses three Inmarsat I-4 satellites. Outfitter Satellite recommends Inmarsat GSPS service for users operating between 50° N and 50° S latitude. Unfortunately, as you travel north of 50° N (or south of 50° S latitude), the Inmarsat satellites tend to be closer to the horizon and the possibility of terrain masking from vertical obstructions such as mountains or trees increases. It is the responsibility of the user to consider this issue before traveling to any given location. Outfitter Satellite's staff can provide you with the elevation angle above the horizon and the azimuthal "compass" angle for the I-4 satellite if you will provide us with the GPS position where you intend to use the satellite.