Comment by XorNot
5 years ago
Also most of the US GPS guided ordnance cannot function when selective availability is enabled.
The reality is that cheap GPS chips enable so much more capability then the risk of your enemy benefiting from a mapping system.
JDAMs apparently have had an inertial system for backup for some time. MEMS gyros are good enough to guide from release to target. DARPA has quietly been working on compact, low-cost guidance without GPS for a while.[1] Doesn't seem to have filtered down to the commercial market yet, and that's probably not an accident.
[1] https://www.darpa.mil/program/micro-technology-for-positioni...