Global positioning system is our best navigation network, but this may change in five years - ABC News
Anti-satellite weapons: History, types and purpose | Space
Global Positioning System - Wikipedia
Brief History of GPS | The Aerospace Corporation
Russian anti-satellite missile test endangers space station crew - NASA | Reuters
Putin is holding GPS hostage. Here's how to get it back.
Cosmic GPS - Aerospace America
War in Space May Be Closer Than Ever - Scientific American
An F-15 Eagle Once Shot Down a Satellite | Anti-Satellite Weapon
Everything You Need to Know About GPS Tracking – Tracki
How would a military force go about shooting down or otherwise disabling navigation satellites (GPS, Glonass, Beidou, etc.) in the event of a war? - Quora
A Condensed History of the Global Positioning System (GPS)
NTS-3, Aiming To Improve On GPS, Starts Integration Tests In August - Breaking Defense
GPS: A $1.4 Trillion Economic Engine | RTI
Anti-satellite weapon - Wikipedia
Satellites like Elon Musl's Starlink are the next front in space war
After GPS was invented, President Ronald Reagan wanted it to be available to all people for their own use. When a Korean Airliner was shot down for invading. - ppt download
GPS rules everything. A new satellite launch keeps a big upgrade rolling - CNET
Op-ed | Get the Bullseye Off GPS - SpaceNews
Six ways satellites make the world a better place
What Happens If GPS Fails? - The Atlantic
Do you know how GPS works? - Bareways
GPS - Telecompedia
