Luscombe Driver,
Sorry I can't help with your request but the thread title reminded me of a story which I thought I'd share with you. I believe it pertains to Qantas in the days when PP Nav was the way to go.
The story revolves around a rather pompous Captain who didn't get on with his Navigator too well.
In order to agravate the navigator one time, the Captain plonked his almost empty coffee cup onto the Navigator's chart, on the track that the Navigator was plotting, so hard that some of the coffee splashed out of the cup onto the chart.
When the Navigator registered his displeasure, the Captain refused to remove the cup, so the Navigator gave heading corrections to steer 'around' the cup. (I don't know the chart scale so don't know the extent of the 'diversion'.)
The story goes, that whenever the pompous Captain and Navigator were crewed together over that route (across the Pacific), the Navigator would give heading corrections around the coffee stain!
Revenge is so sweet!
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bottums up !