A lot of coastal bombing and gunnery ranges maps were overlaid on Admiralty Charts and pre-war range areas were marked on charts. However during wartime any area used for gunnery, bombing or artillery was marked as "Firing Danger Area". What they did mark where the beacons, land based flagstaffs and buoys associated with ranges. They also marked targets. This has proved extremely helpful in identifying where targets for bombing ranges were placed and also confirmed the location of a range that may only have been suspected.
The National Library of Scotland has been making many very good quality scans of maps available online for free and this included Admiralty charts for Scotland, many wartime and postwar ones showing these targets. However some are clearly rifle range targets and this is a reasonable assumption if they were on maps from the Edwardian Period as well.
I recently purchased a second hand book of 352 charts covering the channel coasts of Britain and France dated April 1943. Although in poor condition (it was cheap) it was okay for my purposes but only one chart showed any target and that was Poole Harbour (see attached). One was south of Brownsea Island, which was used by Sandbanks but the other was west of Brownsea and I have now idea what that was for.
Sadly there are not many charts from the wartime period and the decade after available online or for sale at a reasonable price but I hope to seek out more charts to confirm locations and to see if new ones reveal themselves. The Hydrographic Office Archives are down in Taunton so a rather expensive trip but if I am allowed to view many charts it may be worth it.
Meanwhile if anyone has an old chart with "Target" on it somewhere let me know either in this thread or by PM as I already have quite a few.
Has anyone got a wartime or very early post war chart of Strangford Lough that shows where the various targets were located? The charts of that period didn't show bombing and gunnery ranges with their danger areas marked but they did show moored targets and sometimes the range limit buoys. All the charts I have seen have been pre-war of post 1950. The only wartime chart I have seen of the area (NLS collection) has been a much larger area with no detail shown.