# Digital Obstacle File

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The **Digital Obstacle File (DOF)** describes all known [obstacles](/source/Air_traffic_obstacle) of interest to aviation users in the [United States](/source/United_States), with limited coverage of the [Pacific Ocean](/source/Pacific_Ocean), the [Caribbean](/source/Caribbean_Sea), [Canada](/source/Canada) and [Mexico](/source/Mexico). The obstacles are assigned unique numerical identifiers and accuracy codes.[1]

These downloadable products are available at least 21 days prior to their effective date. Data updates (also known as "chart updates") are coordinated over 56-day cycles.[2] There are six to seven of these updates per year. Editions will be listed by year and 56-day cycle number; for example, Edition 200801 was the first 56-day cycle of 2008 (i.e. February 14, 2008).

## References

1. ["Digital Obstacle File"](https://web.archive.org/web/20130215101026/https://nfdc.faa.gov/tod/public/TOD_DOF.html). Federal Aviation Administration. Archived from [the original](https://nfdc.faa.gov/tod/public/TOD_DOF.html) on February 15, 2013. Retrieved July 25, 2012.

1. ["Standing Orders for 56-Day Cycle Aeronautical Publications and Charts"](http://www.fedpubs.com/service/so_56day.htm). Retrieved September 17, 2009.

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Adapted from the Wikipedia article [Digital Obstacle File](https://en.wikipedia.org/wiki/Digital_Obstacle_File) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Digital_Obstacle_File?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.