GPS is based on the longitude and latitude information THAT WE SEND OUT. If that’s messed with - ships could be in a harbor and ‘think’ they’re out to sea... Planes landing would have the same problem... their ‘navigational equipment’ could be telling them one thing and the reality would be another.
Read the link in my last post ...it looks to me like someone’s messing with navigation systems... could be the same with systems used in ICBM’s navigation. If I’m right - we’ve got a problem.
Not really ... it is based on time signals sent from satellites in known orbits. The receiver computes its location in 3-space based on receiving signals from 4 or more satellites. These signals can be jammed, rendering the receiver unable to compute its location. With more difficulty, they can be spoofed causing the receiver to compute an incorrect location. As a receiver moves away from the source of jamming/spoofing, it will begin to detect correct signals and correctly compute its location.
Minuteman ICBMs use inertial navigation. There is no use of GPS anywhere in the flight profile. There is no use of GPS anywhere in the targeting. I know, I did that for a living for several years.
Cruise missiles do use GPS in some cases but they are not ICBMs. Navy SLBMs use inertial guidance like Minuteman but the subs launching them can use either inertial guidance or GPS to establish their launch position.
“GPS is based on the longitude and latitude information THAT WE SEND OUT.”
My Galaxy S7 also uses Russian GPS.