Terms of Use

Last updated October 18, 2026

This free study resource is operated by Jeremy Delvaux, primarily for U.S. learners. By using it, you agree to these terms. Contact support@opensentry.org with questions.

Educational use

Independent educational study resource. Not the FAA or endorsed by the FAA. Not legal advice or for operational flight planning. Exam success is not guaranteed.

Lessons and practice questions support preparation for the FAA remote pilot knowledge test. Practice scores are not an FAA test result, certification, or authorization to fly. Rules and guidance can change. Check current FAA publications, applicable regulations, authorizations, airspace restrictions, notices, and actual conditions before any flight.

Accounts and study progress

Accounts are optional. Keep your sign-in details secure and use an email address you control. Do not access another person’s account or attempt to bypass the site’s protections. See the Privacy Policy for browser storage, cloud sync, and account deletion requests.

Sync and offline availability depend on your connection, browser, and service availability. Unsynced work can be lost when browser data is cleared. Do not rely on this site as your only record of training.

Responsible use

Do not disrupt the service, automate abusive requests, misuse account recovery, or introduce malicious content. Access may be restricted to protect the service and its users.

Content and availability

We aim to provide useful and accurate study material, but errors and interruptions are possible. The resource is provided as available, without a promise of uninterrupted access, complete accuracy, or a particular exam outcome. Please report errors to support. These terms do not exclude rights or responsibilities that applicable law does not permit to be excluded.

Links to FAA and other websites are provided for reference; those services have their own terms and privacy practices. Attribution and any applicable licenses remain with the relevant material.

Changes and contact

Features and these terms may be updated. Revisions will appear here with an updated date. For support or account deletion, email support@opensentry.org.