Global Positioning System Jamming and Spoofing

Discuss the GPS (Global Positioning System) jamming and spoofing and the effect on the mariner.

For the BSR, you need to explain GPS (Global Positioning System) or GNSS (Global Navigation Satellite System), why it is important to industry/economics, and its weaknesses. Is there a weakness? Have other industries been worried about it? What do they do? Explain from the military perspective why jamming has been so important. In short, set the scene to your subject area for the BSR.