Never used Decca in an aeroplane, but as part of the Towers course, in 1965 I spent 2 weeks in one of Aunty Betty's war canoes, HMS Rhyl. As part of the cruise (it was, see later). The somewhat idiosyncratic captain decided that Iain A-R and I should stand watch as Second officer of the Watch. So I am "navigating" this ship up the East Coast en route to HM opening the Forth Road Bridge, and the Decca says I am in Newcastle High Street. The "cruise" - oh yes, a week in Stockholm, and as Iain always said "they don't dance like that in Pinner"