No, we still have to know where the target is. It does mean that we can shoot them when they can't shoot back. It places a premium on the ability to aim the artillery. An arc second is 1/3600th of a degree. At 38 miles, if the aim of your artillery piece is off by ONE second of arc then you miss the target by 55 feet. At 10 miles it is only 14.5 feet, well within the blast radius of the shell.
The circular probability of error for the M777 artillery piece is 200-300 METERS at 15 miles. This means that half of the rounds fired will land somewhere in this circle. This is for conventional artillery rounds only.
A way to get around this is to give the round the ability to know where it is an give it the means to steer itself. This is what the Excalibur artillery round does. This gets the CPE down to 10m at 18 miles. The main problem is that they are bloody expensive.
Hope this helps.
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