I split day four so it would show up on the map better. Travelling through Sacramento the GPS showed height above sea level as between 4 and 8 metres. We are now starting to head up the Sierra Nevada's through a place called Donners Pass http://en.wikipedia.org/wiki/Donner_Pas s. this is where a crowd of emigrants got stuck in a blizzard in 1846 and are rumoured to have resorted to cannibalism to survive. it was a very steep climb and it felt like it wasn't going...