Map of Admiralty facilities on the Isle of Portland, Dorset
Own work based on:✦ Portland, showing the locations of HMS Osprey and the Admiralty Underwater Weapons Establishment.png by SchroCat✦ Maps template-en.svg by Sting✦ BlankMap-World gray.svg by LivingShadow✦ Isle of Portland OS map.jpg Director General of the Ordnance Survey, UK

Derived from;

OSM
Requested by and knowledge from SchroCat
Goran_tek-en