Global Positioning Systems are a key feature in everyday life for much of the world’s population. Whether it’s ensuring a ship delivers its goods safely, or you’re able to avoid a road closure on your commute home, GPS can help. But the system has a weakness - it relies on ground stations that could suffer from blackouts, natural disasters, or cyber attacks. And if those ground stations go offline for long enough, the whole system itself can begin to “drift”. Aerospace engineers have been attempting to counteract this problem for years, but so far with little success. But a new paper from a…