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Belle [3 items]
Construction [40 items]
Farm [37 items]
Garage [38 items]
House Plan [4 items]
Mountain climbing [11 items]
PC [7 items]
Ski [26 items]
Stove [22 items]
Temperature/Humidity [14 items]
Tool [2 items]
Wild animal [10 items]
Wild bird [27 items]
Wild flower [30 items]
Winter Scenery [11 items]
Yatsugatake [5 items]
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天気予報北杜市May 17, 2007
南極から情報発信
「南極観測隊ドクターNAOKOの南極案内」
たまたまblogを発見しました、興味深い内容です。南極点と南磁極が1000km以上ずれているなどとは知りませんでした。
コメント
極点と磁極はズレています。山には国土地理院発行の2万5000分の１の地図を持って行きますが、使用する地形図の緯度により磁北線をエンピツで修正（日本では4度くらい）して書きこみます。コンパスの示す方向と４度ずれているので、雪山でホワイトアウトしたときなどにはシビアなズレとなります。
Posted by: MG@yokohama at May 18, 2007 05:47 PMズレは知っていたのですがこんなにズレているとは。
Posted by: Yoshida at May 20, 2007 11:10 PMせっかくですからコメントをどうぞ