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#surveying #Surveyor #land_surveyor #surveying_America #GPS #how_to_use_gps #what_is_a_land_survey #surveying_techniques #survey_equipment #Leica_gps #Topcon_gps #Trimble_GPS #satellites #navigation #subscribe_to_my_channel #how_gps_works #gps_network #gps_services #how_does_gps_work #ionosphere #gps_satellites #gps_location #gps_tracking #gps_coordinates #gps_navigation #science #general_relativity #global_positioning_system_(invention) #technology_inventions #navstar #glonassКомментарии: