Jindalee Operational Radar Network

The Jindalee Operational Radar Network (JORN) is an over-the-horizon radar (OHR) network operated by the Royal Australian Air Force (RAAF) that can monitor air and sea movements across 37,000 square kilometres (14,000 sq mi). It has a normal operating range of 1,000–3,000 kilometres (620–1,860 mi). The network is used in the defence of Australia, and can also monitor maritime operations, wave heights, and wind directions.