Realizability research of work the geostationary satellite system in a limit range

Geostationary satellite system is used for years as world-range telecommunication system. In modernized marine radiocommunication system (GMDSS-Global Maritime Distress and Safety System) it is a basic technical structure, which gives automatically communication in global range. On account of its realizability the system is particularly important in case of necessity of correspondence during threatening the safety in marine and air transport. The analysis of performed observations and measurements can be formed in two ranges. In exploiting range it can be accepted that exists a possibility of widen the limit of using the geostationary satellite system especially in case of using digital terminals, even portable versions. In research range it seems to be motivated to analyse in simulated conditions the factors, which decide about a geostationary, system terminal's work in the limit of its theoretical range, and possibility to verify current opinions on this subject.