What is a Geostationary Satellite?

There are two types of weather satellites for long and short-term observations, which together give a complete picture of Earth's weather system. GOES or geostationary operational, environmental satellites remain in 36,000 km over the equator, giving detailed, constant and accurate information about the movement of storms, hurricanes, thunderstorms, and other severe weather patterns as quickly as possible, with the help of radar and other ground systems. POES, or polar, orbiting environmental satellites orbit much closer too the Earth's surface and offer visible infrared photos that measure moisture and temperature, tracking weather patterns and climate.
When the information from GOES and POES is combined it takes only six hours to provide a complete picture of weather conditions across the entire surface of the Earth.

Satellites for Navigation

Both sets of satellites also carry search and rescue transmission instruments so that pilots and mariners in distress can relay messages through them for help.