苏标武两种特殊藏本更路簿研究

Study on the Two Kinds of Special Genglubu Owned by Su Biaowu

更路簿常见更路航向表述形式主要有针位航向与真北角度航向两种,而苏标武家有两种更路簿的更路航向表述形式非常特别,有的更路航向既有针位也有小于90度航向记载,有的则仅有小于90度航向记载。基于数字人文的计算及分析,这种航向表述形式隐含有海南渔民熟记于心的岛礁之间的相对位置,形成独特的四种类型的“子午线航向角”表述形式,与360度真北航向表述存在高度可信的转换关系,相关结论得到苏标武的认可。

There are two common expressions of Genglu courses:needle course and true north angle course.Yet the two sets of Genglubu owned by Su Biaowu express Genglu in a special way,in that one has both needle course and course of less than 90 degrees while the other only has course of less than 90 degree.After digital and human computing and statistical analysis,the author finds that such expression implies the relative positions of the islands and reefs Hainan fishermen kept in mind,and it forms a unique four-type"meridian course angle”expression,which has a highly reliable conversion relation with 360 degrees true north course.The conclusions are approved by Su Biaowu.