Quote:Spotter rules still apply for off-board artillery. You will soon find this out in your Bluecoat play through (or the British player will at least...!)
Spotter rules only apply during your turn, they don't apply to defensive fire.
That was what I was commenting on: off-map artillery being able to fire defensively means more guns can fire in support of units not belonging to the same formation, or army, as long as they belong to the same side. For example: 2nd Armored mortars in Carentan fire in support of airborne troops, and I expect British guns will fire in support of US units in Bluecoat as well.
The more long ranged artillery there is, the greater the potential problems this can cause. An example would be the numerous ships in the longest day being able to fire in support of neighbouring beaches, or divisional artillery being able to do so.