Inflatable raft and a compass, both of which I have (I'm prepped). Problem is, a huge event like this will probably screw with the magnetic poles and the compass may be useless. So read the star alignments - except dust and debris in the atmosphere will prevent that. Darn, we're screwed.
No GPS? It should be OK...
As far as I would guess, the sun will still do the east to west thing, won’t it?