Supposedly reporting that they are on the planned course - pipe - and receiving communications without issue - 5 by 5The latter part has an equivalent in old movies (maybe just war movies) where if someone asks if they get the message the response is 'Loud and Clear'.
(,
Wed 21 Aug 2024, 9:04,
archived)
5 by 5is still current, and has been around for donkeys
(
JustHere4Coffee remembers when all o' this were car parks,
Thu 22 Aug 2024, 2:08,
archived)