Our groups house rule on spotting.
#3 = Commanders from Nations that do not have Spotters may have spotter’s abilities with a range of 4 hexes. When spotting other command special abilities may not be used.
#3 Light Mortars = Light mortars have the SA "Indirect Fire" up to their range.
Any non-artillery soldier that is adjacent to a light mortar may spot for the light mortar
up to 4 hexes as long as they have a clear line of sight to the target.
#4 Spotters = All Spotters have the SA “Superior Camouflage”.