Setting aside the crabs for now, the Marshallese are one of the most experienced ocean navigators in the world. Their techniques knowledge and expertise go back 1000 of years and are still continued to this day. A device called a Stick Chart, which you can see here, was created by the islanders to navigate the unpredictable tides and waves over the archipelago. The shells relate to the position of the each atoll or island and the sticks represent the waves, tides and swells. This sophisticated technique has made them masters of the ocean.