Spending a few hundred bucks on a dedicated semi-truck GPS might sound like overkill, especially when your phone already tells you where to go for free. But before you shrug it off, picture this: ...
No audio available for this content. Image: GPS.gov Clocks are at the heart of GPS. Advances in space-qualified atomic clocks that kept time to within 10 nanoseconds over a day were a key development ...
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