[Malcolm G]

In the linked video posted by Our Ned regarding what the RN would call Concentration Dials, the speaker made reference to the markings on the turret, stating that they were intended to communicate bearings to other ships.
There are 'problems' with his assertion:
The markings are not on all the turrets, they are only on the super-firing turret used for a flying off ramp.
The numbers and marks, while quite conspicuous, are too small to be seen and read from another ship.
The is no obvious datum marker visible, just numbers.

The marks are, as I said, used to enable the flying off platform to be brought into the wind. The wind across the deck is best measured from higher up and the information passed to the gun crew to traverse the turret. The markings would be visible to the officer taking the wind direction to ensure that it lined up with his orders.


I have trawled the web and found some pix
1. HMS Benbow with framework for ramp in place.
2 and 3 - USS Texas.