NavList:

Frank
The time I had to do it for reals (26^th Feb 1979) it came as a complete surprise to me.  The pilots hadn’t noticed anything wrong with the Sun and the rear crew sat facing backwards in the dark in what seemed like a cupboard under the stairs.  We were too busy trying to work out why we were using so much fuel and why the HF radio and much of nav-gear had fallen offline (it turned out upon investigation later to be a hot gas leak in the ducting to the leading-edge heating for the port wing partially undoing the big nut holding the fuel pipe onto No 1 or 2 engine and spraying aviation kerosine over the nav-gear, but we didn’t realise that at the time thank goodness).  Anyway, all I did was put what was left of the Sun plus what I imagined was the remainder in the middle of the Smiths sextant graticule and shot away using Sun's centre as usual.  It must have worked well enough, because we still coasted in over Labrador in the correct place.  DaveP