Obstacle Data Team (ODT) - Digital Obstacle File (DOF)

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Digital Obstacle File (DOF)

The Digital Obstacle File (updated every 56 days) describes all known obstacles of interest to aviation users in the United States, with limited coverage of the Pacific, the Caribbean, Canada, and Mexico. The obstacles are assigned unique numerical identifiers, accuracy codes, and are listed in order by state.

To download a file, right-click, then select "Save" / "Save As" / "Save Target As" to save the desired file to your computer. After downloading, use an unzip utility to extract the files. The DOF is a .dat file, so you may use Wordpad or most browsers to access it. If you prefer Notepad: Use the Courier font to retain proper column formatting.

A change cycle's DOF zip file is available the day after the last day of that change cycle:

Product Reflects Changes From Reflects Changes To Release Date
DOF Zip File July 20, 2015 September 13, 2015 September 14, 2015
DOF Zip File September 14, 2015 November 8, 2015 November 9, 2015

Future dates are as follows:

Reflects Changes From Reflects Changes To Release Date
November 9, 2015 January 3, 2016 January 4, 2016

For additional information, please read DOF_README.PDF


Should you discover or encounter an error in any of our products, please check the FAA's Safety Alerts and Charting Notices web page to see if the error has been previously discovered or resolved. If the error is not addressed there, please contact us immediately.

To view PDFs, you will need a copy of the free Adobe Acrobat Reader.

Viewers or converters for Microsoft Word, PowerPoint, or Excel documents can be downloaded from the Microsoft Download Center.


Digital Obstacle File (DOF)
Daily Digital Obstacle File (DDOF)
Construction Notices
Special Requests
Areas of Responsibility (AORs)
Obstacle Types
Power Lines
Frequently Asked Questions (FAQs)
FAQs for the DOF

Last updated: November 23, 2015

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