A Low Earth Orbiting (LEO) satellite is used for broadcasting differential
navigation corrections. Using LEO satellites, the "footprint" of the beam
is much smaller than for geosynchronous satellites, and therefore data
link bandwidth requirements are reduced to sufficiently cover an entire
area. With a LEO satellite transmitting in multiple beams, these
footprints become even smaller. Corrections targeted to such a small area
could have the form of local area corrections (for example, raw
measurements taken from a navigation reference station) using the LEO
satellites.