Geehovah
Decca plus Flight Log (8a?) was fitted to the pilot trainers' at 5FTS Oakington for the Airways' part of the syllabus (only had one ADF) and to facilitate keeping within the local training area when on General Handling'. The Flight Log was excellent and certainly accurate enough to complete an I.F. R/W Approach to a DH of 300', though never "officially". Changing to the correct keys in the turret-head of the Flight Log was vital especially when going "overseas" e.g. Berlin.
Aw Dit.