All definitions
« Back to Glossary Index
« Back to Glossary Index
East is Least, West is Best
VFR Cruising Altitudes 91.159
Based upon Magnetic Course (MC=True Course subtract Variation)
0° to 179° = Odd thousand +500 feet
180° to 359° = Even thousand +500 feet
Also for computing groundspeed winds
Winds from the left you subtract to heading
Winds from the right you add to heading
Source 14 CFR 91.159 · checked 26 Aug 2026