AC-130 don't target coordinates, but instead use direction and distance to the enemy from friendly forces to visually acquire a target
Isn't it possible to train these people to read a map? Maybe get the most intelligent one of the crew to grasp a crayon in his fist and plot the position of the only hospital in the province on a map with a big red
+ and annotate it with words like:
Do not attack the hospital.
Else, just call the hospital "friendly".