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A new technology, Automatic Dependence Surveillance – Broadcast (ADS-B) allows tracking of aircraft using a network of stations on the ground. Instead of installing a whole radar position, a small cabin and antenna can help keep track of flights, allowing them to fly closer together and take advantage of the best flying conditions. This technology is now installed in many parts of the world, with some significant results. When set up across Canada’s Hudson Bay area, ADS-B allowed Nav Canada to reduce the separation between aircraft from 80 nautical miles to 5 nautical miles. This will help cut an estimated 757,000 tonnes of CO2e by 2020.