Still use the whizzwheel. Doesn’t need batteries and will go on for ever.

What never ceases to amaze me is what a mish mash of different measurements we have to deal with: altitude in feet; runway length in metres (or feet); distance in nautical miles; airspeed in mph, kph or knots; fuel in litres; tank capacity in US Gallons….

I was back seat in the new Yak on Wednesday/Thursday, (we got stuck at Little Gransden after some maintenance over-ran and thunderstorms caught us out and had to spend the night in a B&B). Back seat altimeter was in metres, with the sub-scale in Cm of Mercury. Lots of mental arithmetic going on when transiting the low level corridor past NW!

YR