From catalog card: "Directional chart. New [in 1960]"
A stick navigation chart fabricated from mid ribs of palm fronds and Pandanus splines, with shells as place markers for atolls. They were then bound together with coconut sennit in geometric patterns depicting sea currents around low lying atolls. Cowrie shells indicate islands and curved sticks represent wave patterns. "Micronesians are well know for their skills in long-distance voyaging and open sea navigation based on stars and wave patterns. The latter method was the mainstay of navigation on the atoll world of the Marshalls, facilitated by the large number of atolls, which broke the trade wind-driven swell and created complex patterns of wave refraction and reflection. Traditional navigation entailed the memorization of these patterns in their relative sequence and position to each other. For purposes of memory and teaching, the Marshalese navigators designed charts made from the mid ribs of palm fronds and Pandanus splines, with shells as place markers for atolls ('stick charts'). These charts provide information on the relative placement of atolls, wave node points and sea markers, but do not give absolute locations. Moreover, many are uni-directional and focussed on specific atolls. In addition to major overview charts, there are a number of smaller regional charts." [Spennemann, Dirk, H.R. 2005. Traditional and Nineteenth Century Communication Patterns in the Marshall Islands. "Micronesian Journal of the Humanities and Social Sciences". Vol. 4, 1 (25-52)]