With other howitzers, do you also type the target coordinates into a computer shortly before firing, so that these are then sent to the grenade, which uses satellite navigation to steer itself to the target? I wasn't aware of it, but I'm happy to learn.
Can the target coordinates for other howitzers also be sent directly from drones into the computer?
Simple version
In a operating gun line, you have 3 basic parts
1. Command Post
2. Guns
3. Forward Observer/Recon
So the recon unit will have established some kind of target and gives the coordinates to the command post. Recon unit might be using a GPS unit, a drone (which is relaying GPS coordinates), laser, or best guess.
Assuming all the guns already have an established position, the command post computer will process the coordinates of the target, positions of the guns, meteorological conditions, etc. and translate this into direction. elevation and number of propellant charges to fire for each gun (Artillery ammunition is not fixed like small arms bullets).
Forward observer will report back once the rounds land.. target destroyed, adjust fire, etc.
Guided rounds will have receiver (GPS or Laser) to control fins on the round that can make adjustments to maintain accuracy.