When you change the survey average sea level detail or MSL. (Reduction
Mean to sea level), and the highest sea level (Phuket) HSL.(Reduction High to sea level) to use any of the information in the coordinates position indents from sea level up to 20 meters and is divided into sub point coordinates to load the data into camera explore Nikon Total Station NPL model - 352 to open corner/(POLE.1 - 7 , 1 - 7 (in accordance with a survey sent)
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