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Probably NAVSTAR (United States) or GALILEO (Europe), depending on where you are in the world. See "How Does GPS Work" on YouTube: https://youtu.be/FU_pY2sTwTA
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Probably NAVSTAR (United States) or GALILEO (Europe), depending on where you are in the world. See "How Does GPS Work" on YouTube: https://youtu.be/FU_pY2sTwTA