(Not so much a reply to you, Tom, but a general question for all the experts.)

It's my impression that our precision-guided weapons are so good not only because of inherent precision, but due to redundancy too. They have at least two, and maybe three, of: GPS; inertial; laser-pointing, for some types.

The reports I've heard so far say that when the weapons work, they work very well, with a CPE of a few meters. If they possibly can, they will hit the target right on the nose. But the reports of failures describe some wild-assed failures, e.g., cruise missiles straying into Iran, Syria, and Turkey. I haven't heard anything about intermediate failure modes.

What I'm wondering is this: If a gravity-bomb suffered a total system failure, what would its CPE then be?

I recall hearing that passive gravity bombs in WWII had a CPE measured in thousands of meters. Could that be what we're seeing in these two cases?

--Robert