Gun Range is the range to which the guns should fire to hit the target. This is distinct from clock range, which is the distance from the gun to the target, as in most long range actions, the range to the target will change during the time-of-flight.
The difference between clock range and gun range was regarded as so fundamental that the Royal Navy saw fit to ensure that their Dreyer Fire Control Tables were adapted to plot both values clearly by use of separate pencils on their range plots. The difference between the two values in the Royal Navy was expressed as a straddle correction and spotting corrections entered into the Spotting Corrector of a Dreyer table.
- Admiralty, Gunnery Branch (1945). The Gunnery Pocket Book. B.R. 224/45. The National Archives. ADM 234/545.
- Admiralty, Gunnery Branch (1918). Handbook of Captain F. C. Dreyer's Fire Control Tables, 1918. C.B. 1456. Copy No. 10 at Admiralty Library, Portsmouth, United Kingdom.