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2. https://www.u-blox.com/en/product/c94-m8p#tab-documentation-resources
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5. Fumio Ohtomo, Kazuki Osaragi, Tetsuji Anai, Hitoshi Otani, US Grant Patent number US20120277934A1, “Taking-Off And Landing Target Instrument And Automatic Taking-Off And Landing System”, 2011.