[Polybius]

Modern artillary can hit a dime from a distance of 20 miles....

Not really.

For Indirect fires the measurement is indeed CEP (Circular Error Probable)........a circle with centre at target inside which 50% of rounds fired will land.......Desired Low angle CEP is 60 Meters. Threshold Low angle CEP is 120 Meters, Desired High Angle CEP is 150 meters, Threshold High Angle CEP is 275 meters.

[The Duke]

Ooops...I also forgot about the need for "registration rounds", which wouldn't be too popular with the neighbors!

We need a cheap, GPS-GUIDED artillery round!

And, yes, I am aware that I misspelled "artillary" previously - but heck, it was early hours! :(