[hautemarnechris]

I'm sorry not to have responded sooner. I have sent Jap a personal reply to his email.

Re the flights to Denmark: as I explained to Jap, I think 38 Group War Room (which produced the navigation plans for its squadrons) adopted the coding system for turning points because the high volume of missions to Northern France in July and August combined with the fact that 38 Group was using a standard "bus route" into Northern France (see AIR 8837). Thus there would have been a lot of repetition of lat/longs if they had continued to provide the turning points in clear. It seems to me that the coding systme was adopted to reduce message sizes and to avoid transcription errors (although I can't prove that).

AIR 8820 shows that by November (by which time missions to France ended) 38 Group had returned to specifying turning points in clear. For the most part the post-November missions are to Scandinavia and were relatively low in number compared to 38 Group's activities during the Summer of 1944. I imagine (but haven't checked it out) that the "bus route" concept for routing missions didn't apply to Scandinavia and therefore coded turning points weren't useful.