1. During World War II, he developed a two-star sextant for air navigation . 2. He foresaw future developments of the French civil and military air navigation . 3. Non-directional beacons used in air navigation use Morse to transmit their identifier. 4. Combined with the airspeed and heading, air navigation complexity was greatly reduced. 5. GPS systems used for air navigation can use magnetic north or true north. 6. This seminar recommended the establishment of a new air navigation centre. 7. The wind triangle describes the relationships among the quantities used in air navigation . 8. Air navigation service providers are either government departments, state-owned companies, or privatised organisations.9. After the war, �mile Allegret started a career as an air navigation engineer. 10. Tests are taking place on similar Future Air Navigation Systems throughout the world.
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