Polynesian navigation 

Polynesians watched the waves, whose direction and type relinquished useful navigational secrets.

The Polynesian reproduced their wave experiences in a certain kind of map: the stick-charts, see Embassy of the Marshal Islands.
Those marine maps are compared with the web of modern organisation software: http://www.evoq.be/page6b.htm 
Here an exact explanation by Dirk H.R. Spennemann how a stick chart functions:

A further article about Polynesian navigation: http://www.museum.upenn.edu/Navigation/Misc/contents.html
Ethnomathematics treats Polynesian navigation, too: