The AIP Supplement 069/2018 issued 13 December 2018 was the last supplement about frequency transitions that AIS intend to issue, but there are still airfields listed in the CGC Field Book and UK Landouts that have not yet converted to 8.33 kHZ spacing. Some of these are gliding sites. AIS says that these conversions will be notified through their AIP entry as they are planned and completed, which means that these updates are may be to be published after the changes are accomplished. So, if you find these files useful and know of a planned 25kHz -> 8.33kHz conversion that we haven't shown, kindly let us know so that we can include this information as soon as possible.