NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: U.S. Standard Atmosphere Supplements
From: Marcel Tschudin
Date: 2005 Aug 30, 22:31 +0300
From: Marcel Tschudin
Date: 2005 Aug 30, 22:31 +0300
Marc, thank you for information > There is also an International Standard Atmosphere (ISA) published by > the International Civil Aviation Organization (ICAO). This is used > for aircraft performance calculations. Standard sea-level temperature > and pressure are 15C and 1013.25 HPa To my knowledge, these standard conditions you indicate are more often used than those of the Nautical Almanac, i.e. 10C and 1010hPa; and there are still other standard conditions. One has to be careful when comparing data from different sources. Referring the two graphs, which might be out of the U.S. Standard Atmosphere Supplement: Since the temperature profiles represent averaged data they might also be related to averaged pressures. Marcel
