The two sub-systems are air data system (ADS) and tactical air navigation system (TACAN).

以塔康系统为例对特定频段导航系统信号进行了分析和模拟。

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In 1919, the International Commission for Air Navigation (ICAN) was created to develop General Rules for Air Traffic.

1919年，国际航空委员会(ICAN)成立，并开始制定空中交通通用规则。

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"User charges" means a charge imposed on airlines for the provision of airport, air navigation, or aviation security facilities or services including related services and facilities.

“使用费”，指提供机场、空中导航或航空保安设施或服务，包括相关服务和设施，而向空运企业收取的费用。

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This milestone in aeronautical history marks the first use of the sextant in air navigation.

UNESCO: MEDIA SERVICES

To wit, Congress ought to abolish the FAA and privatize the air navigation system the way that Canada and other developed countries have.

WSJ: Review & Outlook: Flight Delay Rebuke

The offer will apply to Canadian air carriers, including Air Canada, the country's largest and No. 10 in the world, airports and NAV Canada, which provides air navigation services.

CNN: Canada to aid airlines, airports with insurance