GAO: Pentagon Lacks Business Case for GPS Alternatives - Location Business News - RNTF
BAE Systems develops GPS alternative, enter Navsop | TweakTown
Building an Alternative to GPS - IEEE Spectrum
U.S. Naval Office Looks for Methods to Strengthen, Alternatives to GPS - Inside GNSS - Global Navigation Satellite Systems Engineering, Policy, and Design
Real-Time GPS-Alternative Navigation Using Commodity Hardware: Fletcher, Jordan L.: 9781288405527: Amazon.com: Books
DARPA Pursuing Global Positioning System Alternatives
US Department of Transportation Seeking Alternatives to Advanced Navigation GPS | Blogs | Altium
Satellite navigation - Wikipedia
DOD failing to track progress on military alternatives to GPS, GAO says - FCW
Takeaways from the DOT study of GPS alternatives - NextNav
No GPS, No Problem: Honeywell Invents, Demonstrates Military-Grade Alternative Navigation Technology – sUAS News – The Business of Drones
5 GPS Alternatives You Should Know | Beebom
An Alternative to GPS? – POTs and PANs
Explainer: NavIC, India's home-grown alternative to the GPS navigation system | Reuters
Alternatives to GPS | MrReid.org
Developing an Alternative To GPS with a HackRF
Alternative to GPS: How to Get Better Accuracy with Images - Mosaic51
Defense Innovation Unit helping Army find alternatives to GPS - SpaceNews