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Digital Obstacle File (DOF)

Beginning September 8, 2019, the Daily DOF, Daily CSV File, and beginning September 10, 2019 the DOF product will no longer contain dismantled obstacles. These are obstacles flageed with an action code of 'D' for dismantled. This does not affect the DOF Change Files and weekly Construction Notice, which will continue to include obstacles which have been dismantled. It does include the DOF which is posted to the Aeronautical Data Delivery Service (ADDS) site.

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 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. If you download a zipped file, 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.

NEW - Please note that all normal release dates have recently been changed from Mondays to Tuesdays.

Digital Obstacle Files
Product Reflects Changes From Reflects Changes To Release Date
DOF (Zip) May 20, 2019 July 14, 2019 July 16, 2019
DOF (Zip) July 15, 2019 September 08, 2019 September 10, 2019
DOF (Next) September 09, 2019 November 03, 2019 November 05, 2019

DOF Frequently Asked Questions (FAQs)

For additional information read DOF ReadMe (PDF)

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