[JasonC]

Terminal homing isn't limited to GPS. IR guidance for terminal homing is a very promising technology, for arty itself. Essentially you fire missions just as before, but a tiny heat seeker in the nose of the fuse looks for the heat signature of tanks and such, and steers small course adjustments in the final descent. Not perfect, but can give each shell something like a 50-50 shot of a direct hit. And that makes arty HEAT a top attack heavy armor killer. We should be developing this for 155s as well as 120s and MLRS, not sneering at it.

[Darksheare]

Copperhead rounds, IR guidance.
GPS guidance has already been looked into for artillery rounds.
Basically, they had a round that could turn around and hit the gun firing it.
(Slight stretch there, but the round can curve it's flight.)

Will it ever see actual production and deployment?
Not anytime soon in the US.
*sighs*
I was in artillery once, and had heard about these nice toys in development for us.
Problem was that the high brass didn't like us much.
They kept declaring us as obsolete.