Some of you may be aware that the Micronesian navigation system was as orthogonal to the western system as their naval architecture. The root document on Micornesian navigation is, imho, the chapter by Ed Hutchins, attached here FYI. (Oops. profile won’t let me attach the PDF. here isa link
http://mind.ucsd.edu/syllabi/06-07/Phil285/readings/Hutchins-chap2.pdf )

I found a link - was it here ? to this video of crazy french twins crossing the atlantic in a proa-like ‘outrigger canoe’ (seems like a tacking proa)  in 2003 with no instruments of any kind. Probably well known here but If you don’t know it, check it out.
http://www.youtube.com/watch?v=H1xAPJpnWnc
http://www.creartisto.com/sansboussole/expedition_en.html