The abundance of ideas for location codes proves the demand for simple answers to the simple question "where?", see www.volksnav.de/YouAreHere. Street names, lat/lon and post codes aren't simple. The cities Mannheim, Brasilia etc. begun to answer the question without street names but they adopted SQUARE grids, a self-strangulation. Other codes also base on square grids and have only one global reference. What costs little. Polar grids have an global/urban/indoor reference, have no limitations, support the natural angle orientation and in my case divide the horizon into 12 instead of 360 main directions and - like the OpenStandard "r100" - are METRICAL. See also Touristic attractions in Manaus www.ManausOnline.com click Turismo / Pontos turisticos ISO www.isotc211.org/Address/standards.htm Navipedia/ESA www.navipedia.org/index.php/Step_By_Step_Navigation
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