![TIL Airport runway numbers aren't sequential, they are based off compass bearings. Runway 9 would be 90 degrees, runway 27 is 270 degrees... : r/todayilearned TIL Airport runway numbers aren't sequential, they are based off compass bearings. Runway 9 would be 90 degrees, runway 27 is 270 degrees... : r/todayilearned](https://external-preview.redd.it/tQeVha0CEssxdfhYvQiwu0XcoOjp9GuA7oWOkny4gKo.jpg?auto=webp&s=91a04804edc155a6bf80f686647e23ab476762d1)
TIL Airport runway numbers aren't sequential, they are based off compass bearings. Runway 9 would be 90 degrees, runway 27 is 270 degrees... : r/todayilearned
![Airport Runway Names Shift with Magnetic Field | News | National Centers for Environmental Information (NCEI) Airport Runway Names Shift with Magnetic Field | News | National Centers for Environmental Information (NCEI)](https://www.ncei.noaa.gov/sites/g/files/anmtlf171/files/wmm2015_d_merc.jpg)
Airport Runway Names Shift with Magnetic Field | News | National Centers for Environmental Information (NCEI)
![Airport Runway Names Shift with Magnetic Field | News | National Centers for Environmental Information (NCEI) Airport Runway Names Shift with Magnetic Field | News | National Centers for Environmental Information (NCEI)](https://www.ncei.noaa.gov/sites/g/files/anmtlf171/files/compass_illo_draft.jpg)
Airport Runway Names Shift with Magnetic Field | News | National Centers for Environmental Information (NCEI)
![flight instruments - What's the difference between True vs Magnetic headings? - Aviation Stack Exchange flight instruments - What's the difference between True vs Magnetic headings? - Aviation Stack Exchange](https://i.stack.imgur.com/cx3Wbm.gif)