This information is from
the GPS World website:
Almanac: GPS, Glonass, and
satellite-based augmentation
systems (SBAS) constellation
data and information sources
How Does GPS Work?: a brief
overview by GPS World
"Innovation" columnist Richard
Langley.
Acronyms
Glossary
Other Web Sites on GPS and
Related Issues
On-line GPS Tutorials
Receivers vs. Tracking
Basic Timeline of GPS
Development
Downloadable 34-page PDF of
GPS History, Chronology, and
Budgets
