Researchers Find Crippling Flaws In Global GPS
mask.of.sanity writes "Researchers have developed attacks capable of crippling Global Positioning System infrastructure critical to the navigation of a host of military and civilian technologies including planes, ships and unamed drones. The novel remote attacks can be made against consumer and professional-grade receivers using $2500 worth of custom-built equipment. Researchers from Carnegie Mellon University and Coherent Navigation detailed the attacks in a paper. (pdf)"
Planes and Ships don't rely on GPS.
If you have a license to pilot any of them, you have learned how to navigate without.
Cost free eBook I read (by iBook/Kobo/Amazon/ObookO/Gutenberg etc.): "The Green Odyssey" by Philip Jose Farmer.