A Maginot Line In The Sky by Ralph Peters

[George Raihala]

That's true but with newer rounds like Excalibur, a recent variant of MLRS, guided bombs (that can work in bad weather as opposed to laser guidance), as well as telling where the average soldier is being dependant on GPS. It's better to have a backup that makes these things function as they are supposed to.

JDAMs are GPS-aided weapons. They have a very accurate INS that does the actual guiding. If the GPS never locks on, or is denied, the weapon will still guide, albeit slightly less accurately. However, JDAMs going INS-only have been generally been as accurate as the GPS-aided spec for the weapon.

The same holds true for a number of other weapons.

George