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As you can see in the map, there are exactly 100 MGRS squares each covering 10,000 km² spread over Thailand, except those squares at the UTM zone boundary at 102° East. Someone better at graphic art can now use that KML file and the country boundaries to create a nice appealing emblem for Thai Geograph.
Actually, I did this coding not for this purpose, but to easier parse the coordinates in the Royal Gazette announcements - those few I tried sometimes had a wrong letter code, sometimes the letters were omitted as being clear from the rough location, or even had obvious wrong codes. With this and smaller scale grids I can easier notice where the subdistrict or village boundary marker is supposed to be, when the direct coordinate conversion fails.
By the way, my readers in Germany might be interested in the Geograph Germany, which just now reached 1% coverage - but still more than 300,000 square kilometer without a photo.