The European EGNOS augmentation system has been undergoing live trials for some time. It is due to become fully operational in 2004 (according to the ESA
).
WAAS
Pro: Can use 'standard' GPS receiver (I think?)
Pro: Funded by FAA and Department of Transportation (not DoD), so approval for aviation use is guaranteed
Con: No accuracy / reliability information available
EGNOS
Pro: Provides reliable indication of positional accuracy
Pro: Compatible with GPS and GLONASS
Con: Requires EGNOS receiver (could limit usage in the short term)
The limitation of any augmentation system of this type is the fixed geographic area that they cover.
TG.