In General Quarters Version 3.3, revised and fully updated with amendments I noticed tertiary battery size and tertiary battery boxes in red on several RN ships. Examples would be 4.7" on HMS Rodney, 4" on HMS Barham, Malaya, Warspite, and Ramilles. I also noticed this on several RN destroyers as secondary batteries (4" on HMS Kipling, 3" on HMS Hero, etc.). The German Navy also has this on tertiary batteries on battleships and pocket battleships. My question is what is the significance of this, what rules impact is involved (can't find any but it might be me)?
Thanks,
Ed