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

The FAA's Aeronautical Information Services is consolidating websites, and this page has moved to a new location.
We will stop updating this page as of Monday, April 25, 2016.
We will leave only the new page link on Monday, May 2, 2016.
Please update your bookmarks for this page to: http://www.faa.gov/air_traffic/flight_info/aeronav/digital_products/dof/

Please send any questions to Dan Gerecht at Daniel.B.Gerecht@faa.gov.

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 January 4, 2016 February 28, 2016 February 29, 2016
DOF Zip File February 29, 2016 April 24, 2016 April 25, 2016

Future dates are as follows:

Reflects Changes From Reflects Changes To Release Date
April 25, 2016, 2015 June 19, 2016 June 20, 2016
June 20, 2016 August 14, 2016 August 15, 2016
August 15, 2016 October 9, 2016 October 11, 2016 *
October 10, 2016 December 4, 2016 December 5, 2016
December 5, 2016 January 30, 2017 January 31, 2017
* Note: release date for October will be a Tuesday due to the Monday holiday.

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: April 25, 2016

Questions about this page? Please contact us.