The Digital Obstacle File describes all known obstacles of interest to aviation users in the U.S., with limited coverage of the Pacific, the Caribbean, Canada, and Mexico. The obstacles are assigned unique numerical identifiers; accuracy codes, and listed in order by state. Please see the DOF Readme file (PDF) for additional information.

Note: When downloading large files, it is best to download one file at a time using a broadband internet connection during off-peak hours.