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Canadian airspace is the region of airspace above the surface of the Earth that falls within a region roughly defined as either Canadian land mass, the Canadian Arctic or the Canadian archipelago, as well as areas of the high seas. Airspace is managed by Transport Canada and detailed information regarding exact dimensions and classification is available in the ''Designated Airspace Handbook'' which is published every fifty-six days by Nav Canada.〔(【引用サイトリンク】 publisher = Nav Canada )〕 == Canadian Domestic Airspace == The "Canadian Domestic Airspace" includes all of Canada and extends out over the Pacific, Arctic, and Atlantic Oceans. It is broadly divided into the "Northern Domestic Airspace" (NDA) and the "Southern Domestic Airspace" (SDA). There are three main differences between the two areas, the most important of them being that the NDA is designated as a "standard pressure" region while the SDA is an "altimeter setting" region. This means that pilots operating in the SDA will calibrate their altimeters to atmospheric pressure according to information available at airports and through weather services. Conversely, in the NDA, pilots calibrate their altimeters to 29.92 inches of mercury (1013 hPa) regardless of the actual atmospheric pressure. This is done because weather information is not available for all areas of the far north, so it is better that all pilots use a standard setting in order to avoid collisions. Another major difference between the NDA and SDA is that magnetic declination is not used in the NDA. Because the magnetic north pole is in the NDA, magnetic declinations are very large; sometimes even 180°. This is further complicated by the fact that magnetic north moves approximately 200 miles (320 km) in an elliptical path every day. For these reasons, "true" tracks are always used in the NDA while magnetic tracks are frequently used in the SDA for convenience. The final difference between the NDA and the SDA has to do with the location of Class A airspace in each region. This is explained in more detail below. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Canadian airspace」の詳細全文を読む スポンサード リンク
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