Putin is holding GPS hostage. Here's how to get it back.
Lesson 1: The GPS Signal
Why the Military Released GPS to the Public
What would the world do without GPS? - BBC Future
India joined exclusive club with anti-satellite missile test: Here's what it means for the world
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
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 World - The Business and Technology of Global Navigation and Positioning
Do you know how GPS works? - Bareways
India's Satellite-Shoot-Down Test Should Raise Fears About Space Junk
Russian anti-satellite missile test endangers space station crew - NASA | Reuters
An F-15 Eagle Once Shot Down a Satellite | Anti-Satellite Weapon
GPS Isn't Very Secure. Here's Why We Need A Backup | WIRED
China and Russia Could Cripple the US With a Space Attack, but the US Is Pushing Back
Russia warns it can destroy NATO satellites as White House says it has 'serious concerns' | Daily Mail Online
What on Earth is the Global Positioning System? > U.S. Department of Defense > Story
Air Force: GPS Satellites Vulnerable to Attack
GPS rules everything. A new satellite launch keeps a big upgrade rolling - CNET
Army ponders satellite partners for 'Lonestar' GPS interference warning system - Breaking Defense
Anti-satellite weapons: History, types and purpose | Space
GPS: A $1.4 Trillion Economic Engine | RTI
Everything You Need to Know About GPS Tracking – Tracki
Op-ed | Get the Bullseye Off GPS - SpaceNews
What Happens If GPS Fails? - The Atlantic
