Services and electrical
Reading a nautical chart — datums, distances, light characters and buoyage
A nautical chart carries three datums at once: depths from the lowest water, clearances from the highest, and light heights from the mean — each taken at its worst case
This drawing comes from one YAML file. No shape was moved by hand.
Notes in the source (in Japanese)
1 枚の海図に、基準面が 3 つある。
水深は最低水面から、橋の桁下高と海岸線は最高水面から、灯台の高さは平均水面から。深さと高さを別の面から測るのは、それぞれ「いちばん危ないとき」を取るため。
距離は縦(緯度)の目盛りで測る —— 緯度 1 分 = 1 海里 = 1852m。メルカトル図法なので、経度 1 分は緯度が高いほど短くなる。
入港するとき右が赤(日本は IALA-B)。欧州の A 方式とは左右が逆。
Source (YAML)
examples/gallery/223-海図の読み方.zumen.yaml
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