My historical two cents. Bradley Fiske (USN officer and a holder of numerous patents for navigation aids), is credited in American records as the man who invented and introduced a device into American service that was later called a telemeter. This was a calibrated telescope that measured distances between ships by using a height-finder method based on known mast heights of certain ship classes. Coupled with horizon range tables that were published in a navigator's atlas prepared by the US Naval Observatory, the telemeter could convert angle measurements directly into distances to a target by built in trig computation in the telescope mount itself. It was not precise enough for gunfire as it could only provide a scalar solution with no correction for cross motion, but it was the first instance in the American navy of a ranging instrument better than iron sights and the weather eye. This was in 1888. As far as I know, other navies had inventors who either duplicated or originated their own versions of the Fiske telemeter at about the same time. It is not something historically unique to Fiske. The British and the Germans, I know, were using similar devices for station keeping in formation by 1895 aboard their capital ships. I suggest that modern optical fire control systems, thus, can trace their origins back to such early American, British, and German systems.
I see no reason why a gun director or an optical system similar to a gun director setup, could or would not be part of a US warship's standard nav-aids systems in the 1920s.
Curiously; one of the early USN considerations for the Huhlsmeyer system was as a radio-ranging nav-aid system for station keeping. From there to radar is not that big a leap.