I remember the Decca system on the North Sea, a rather nice paper moving map and a squeaky pen that indicated a position, not necessarily the correct one? If the map got wet (leaky roof in the old 61 when it rained) the map refused to drive over the rollers and went soggy, and the squeaky pen tangled in the wet paper.
Thank goodness for modern technology, lovely GPS in the car but the lady who talks sometimes reminds me of the wet map and squeaky pen, bloody infuriating.
outhouse
