Re: Wow
"... 2/ Inertial Navigation System (INS)"
True INS tends to be pricey. But in many applications your navigation system will know where it is before jamming starts and has a map and compass so it can keep track of turns in the roads to update its approximate position. That (and impulses from wheel sensors, for distance travelled, and from steering wheel sensors, for heading) was what was used in the original, pre-GPS, car navigation systems. Might not be too difficult to bolt on to GPS-based navigation systems. Depends what accuracy you're looking for.
Incidentally there are compact INS modules for navigating in mines, etc.
http://www.appliedminingtech.com/mining-guidance-system/
http://gpsatsys.com.au/products/other/inertial-labs/
Biting the hand that feeds IT
