Reference: https://aip.dfs.de/BasicVFR/2024JUL11/chapter/bf16ff4b3b6d26245c1ec9baabebbffd.html#popupPermalink
Reference: https://aip.dfs.de/BasicVFR/2024JUL11/chapter/bf16ff4b3b6d26245c1ec9baabebbffd.html#popupPermalink