point the aircraft at the sun, then 15 x GMT-west long will give you your true heading
I've not heard of that one before ... useful ... will have to think how that works.
Well I gues if you are very near the pole, everyway is south..................
Yeah .. but say over northern Greenland that could be either Russia or the Atlantic ... it would be easy to go 'over the pole' by mistake ...
Re. Hand held GPS units .. interesting some do work, I have heard of passengers esp with bluetooth units on the window works ... Trouble at the pointy bit the glass has heated elements and blocks the signal ...