@ARTICLE {, title = {O elementárním modelu GPS systému}, author = {Horský, Jan and Navrátil, Vladislav}, journal = {Obzory matematiky, fyziky a informatiky}, year = {2008}, volume = {37}, number = {4}, pages = {37--41}, issn = {1335-4981}, abstract = {The article deals with the basic physical principle of GPS. We emphasize the role of relativity of simultaneity here.}, }