The Jindalee Operational Radar Network (JORN) is an over-the-horizon radar (OHR) network that can monitor air and sea movements across 37,000 square kilometres (14,000 sq mi)[citation needed].
It has a normal operating range of 1,000 kilometres (620 mi) to 3,000 kilometres (1,900 mi). It is used in the defence of Australia, and can also monitor maritime operations, wave heights and wind directions.
The system is operated by the Royal Australian Air Force (RAAF) and is capable of detecting targets at ranges of up to 3,000 km (1,864 mi). JORN uses radar to detect and track aircraft and ships, and can also be used for early warning of missile launches. It is a joint Australia-United States system and is operated from the RAAF Base Tindal in the Northern Territory of Australia.