Chester's CXAM radar and the geography of early warning

Chester was among the first ships fitted with CXAM radar, showing that American forces had pursued radar before the Second World War rather than simply receiving a British invention. Britain reached an operational system first in part because its institutions and geography created a more immediate warning problem. Threats could approach across the North Sea or sit astride the Mediterranean route through Suez to Singapore. A Far Eastern fleet would also fight on the opposite side of the world from Britain's industrial center, so any warning that reduced damage and losses had unusual value. The United States had greater oceanic depth against threats approaching across either the Atlantic or Pacific.