We, Mortons, had Decca. Didn't use ink as maps were not that plentiful. One captain carried a soft brass suede brush to burnish round things that may have been Decometers.
Eagle even got a Dove to fly between Dundee and Glasgow. I was sent up there as the Decca operator which pleased me NOT. Our hangar which just covered the nose and engine fronts, got hoiked out of the ground and went off down the river probably unaware of where it was going. :-) Never been so cold in all my life. Used to drive the company car for hours as the Italian football team had hogged all the emergency heaters.