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so one letter is 32 bit, it is used for 2 coordinates (so 16 bits) and each first bit is used for high or low window, then subsequent bits divide the precision by 2. (so divide by 8 in the best case) but there is an alternance between lat and long precision, so it ends up dividing by 4 and 8 alternatively 1 ±2500 2 ±630 3 ±78 4 ±20 5 ±2.4 6 ...



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