I once heard a really unique orientation talk about http://www.volksnav.com http://www.volksnav.com – based on the idea of polar coordinates like on an imagined

I once heard a really unique orientation talk about http://www.volksnav.com http://www.volksnav.com – based on the idea of polar coordinates like on an imagined clock dial flat on earth centered at your local reference point (e.g. city center) and 12 o'clock = south. Used in one city in Brazil, I think.