@article{oai:minpaku.repo.nii.ac.jp:00004392,
 author = {秋道, 智彌 and Akimichi , Tomoya},
 issue = {4},
 journal = {国立民族学博物館研究報告, Bulletin of the National Museum of Ethnology},
 month = {Mar},
 note = {This paper describes the yetak system, one of the spatial
allocation techniques for sea space, employed by navigators in
the Caroline Islands of Micronesia. Without modern navigation
aids Micronesian navigators have utilized particular strategies
for locating themselves on and allocation of the sea. In general,
a sea area between two neighboring islands is conceptually
segmented into 28 sections. In inshore waters, where an island
is visible, these are recognized by serial changes of island shape.
Further seawards, where an island is not visible, the use of
a reference island(s) coordinated with the movement of the canoe
enables navigators to reckon their position. One yetak is equiva-lent
to about 18-20 km. The yetak system is the deliberate
application of knowledge of both the sidereal compass and
island orientation (woofanuw).},
 pages = {931--957},
 title = {サタワル島における伝統的航海術の研究 : 洋上における位置確認方法とエタック（yeták）について},
 volume = {10},
 year = {1986},
 yomi = {アキミチ, トモヤ}
}