Late 1970s, an AEW Shacklebomber heading slowly down the east coast in the teeth of a headwind for PIs of CY. FM at Boulmer is bored,
FM: "Anyface XX, you'd be better on 125."
Anyface: Boulmer, wait........ Negative, my nav say my current heading is good."
FM: Anyface XX, I meant the train......."