Skip to page content

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 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) April 20, 2020 June 14, 2020 June 16, 2020
DOF (Zip) June 15, 2020 August 09, 2020 August 11, 2020
DOF (Next) August 10, 2020 October 04, 2020 October 06, 2020

DOF Frequently Asked Questions (FAQs)

For additional information read DOF ReadMe (PDF)

Page last modified:

This page was originally published at: