Another Decca navigation system was HiFix, which got used in several parts of the world for accurate surveying
Spent a few years in the hydrographic survey world
radeng and part of my job was flying the HiFix stations ashore to be set up and dismantled at the end, put a receiver in the aircraft as well so could fly around coast lines and map those as well. Part of it was revising maps made by Captain Cook, amazing how accurate he was when you consider the technology he was working with.