http://homepage2.nifty.com/o_compass/

http://www2s.biglobe.ne.jp/~matoba/public/olk/download/mulka/mulka2.htm

http://hama-olc.cocolog-nifty.com/blog/2005/03/20050327___1.html

http://www.orienteering.com/~saitama/index.html