The map and the rotation map set which install the magnet in the compass north belt

摘要

(57) Abstract Topic The map itself directing to due north, it rotates, stands stillThe ru map is made. As for rotation and standstill operation in this map rain and windWhen it is stabilized even among them wasaseru. Solutions To install the magnet in the compass north belt in the map, the cover attachingWhen it hangs in su, as for the map without receiving the windage the rain andIt rotates by power of the magnet, due north faces and stands still.