GPS is super useful when you're trying to navigate unfamiliar areas in cars and on foot, but for ships, it's an outright lifeline. Many vital systems, especially on large commercial vessels, rely almost entirely on GPS data, meaning it's a pretty huge deal when satellite connection is lost. GPS is far from infallible, and signals can be jammed by equipment and even solar storms, which is why the UK has begun rolling out a fallback positioning network that uses technology first implemented by the US Navy during WWII. The once-popular Loran positioning system was essentially superseded by GPS, but in a twist to the tale, the UK is using an improved version, known as eLoran, to ensure ships aren't completely reliant on satellite signals. Trials started at the beginning of last year, and the first seven eLoran stations are now live along the East coast of Great Britain, with all the UK's major ports expected to be covered by 2019.