# Sources: drone software and rules

> Where our figures come from: USI and AVweb on Part 108, EASA on the specific category, FAA on Remote ID, Pix4D on GSD and the ArduPilot forum on licences.

- Canonical URL: https://autonomousdronesoftware.com/sources/
- Checked: 2026-10-26

## Checked on 25 October 2026

- [USI, Get Part 108 Ready (last verified 25 September 2026)](https://www.flyusi.org/guides/get-108-ready): timeline, OIRA review, proposed permits, certificates, weight, operations supervisor, data service providers, right-of-way, Remote ID.
- [AVweb, 29 January 2026](https://avweb.com/aviation-news/aviation-law/faa-reopens-part-108-bvlos-comment-period/): the reopened comment period on right-of-way and electronic conspicuity.
- [EASA, EU UAS Regulation: specific category](https://www.easa.europa.eu/sites/default/files/dfu/EU_UAS_Regulation_specific-category.pdf): STS-01, STS-02, PDRA-01, SORA, LUC.
- [EASA, operational authorisation](https://www.easa.europa.eu/en/domains/civil-drones-rpas/specific-category-civil-drones/operational-authorisation): the specific-category pathways.
- [FAA Safety Team, Remote ID talking points (August 2023)](https://www.faasafety.gov/files/gslac/library/documents/2023/Aug/388879/Remote%20ID%20Talking%20Points%20FINAL%20v2.1.pdf): who must comply, the three ways, the broadcast content, the compliance date.
- [Pix4D documentation](https://support.pix4d.com/hc/en-us/articles/202557469): the flight height and GSD formula, real focal length.
- [ArduPilot discussion forum](https://discuss.ardupilot.org/t/px4-vs-ardupilot-when-to-choose-what/14262): BSD and GPL implications, frame flexibility, field performance (community views; the thread warns that both projects have changed since).

## Built-in assumptions

- Camera presets use typical public specifications for 1-inch, 4/3 and full-frame mapping cameras; check your own camera's figures.
- Default overlaps (75% front, 65% side) are common starting points, not rules.

## Open points

- The final text of Part 108, once published.
- PDRA-02 and PDRA-03 status in EASA's latest documents.

## Added on 26 October 2026 (Part 107)

- [FAA, becoming a certificated remote pilot](https://www.faa.gov/uas/commercial_operators/become_a_drone_pilot): eligibility, the seven steps, Part 61 route (ALC-451), recurrent courses ALC-677 and ALC-515.
- [eCFR, 14 CFR part 107 subpart B](https://www.ecfr.gov/current/title-14/chapter-I/subchapter-F/part-107/subpart-B) and [subpart C](https://www.ecfr.gov/current/title-14/chapter-I/subchapter-F/part-107/subpart-C): operating limits, eligibility, recency, retesting, knowledge areas.
- [FAA, UAG sample questions (10 August 2021)](https://www.faa.gov/sites/faa.gov/files/training_testing/testing/test_questions/uag_questions.pdf): 46 sample questions; the full test has 60.
- [FAA, register your drone](https://www.faa.gov/uas/getting_started/register_drone) and [FAA, Remote ID](https://www.faa.gov/uas/getting_started/remote_id).
- [FAA, airman knowledge testing matrix (revised 24 April 2023)](https://www.faa.gov/sites/faa.gov/files/testing_matrix.pdf): UAG, 60 questions, 2 hours, minimum passing score 70, minimum age 14. This closes the earlier open point on time and pass mark.
- Open point: the test fee is not on any FAA page we read; the $175 shown is widely reported and marked as such.

## Second review, 26 October 2026

- [PX4-Autopilot licence file (BSD 3-Clause)](https://raw.githubusercontent.com/PX4/PX4-Autopilot/main/LICENSE) and [ArduPilot licence page (GPL v3)](https://ardupilot.org/dev/docs/license-gplv3.html): the licence facts now rest on the projects' own texts rather than on the forum thread alone.
- Part 108: no Federal Register publication found in a search on 26 October 2026; the USI status of 25 September 2026 still stands.

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