EFAS← efas.app

Terms of Use

Effective 18 September 2026 · EFAS (Enhanced Flight Augmentation System), published by ADDIE OÜ, Estonia.

These Terms of Use form a binding agreement between you and ADDIE OÜ for your use of EFAS; where you obtained EFAS from an app store, that store's applicable end-user licence terms also apply (see §2). By downloading, installing, or using EFAS — or by accepting these Terms on first launch — you agree to them. If you do not agree, do not use the app.

1. Operational status — reference only

• Information may be incomplete, delayed, or incorrect and must never be used as a primary or sole means of navigation or operational decision-making. Always cross-check against current, approved and official sources.
• The pilot in command remains solely responsible for all operational decisions at all times.
• The Dangerous Goods (DGR) module is derived from the public US 49 CFR §172.101 table — it is not the IATA DGR. Packing-instruction numbers and State/operator variations must be verified against the current IATA DGR / ICAO TI. Quantity limits shown are per package.
• Weather, NOTAM, model and runway-condition information originate from third-party public sources and are provided "as is".

Assumption of Risk, Release and Covenant Not to Sue. EFAS is a supplemental reference and situational-awareness tool. It is not a substitute for official aeronautical information, certified equipment, operator documentation or regulatory sources, and it is not certified for operational use. By using EFAS you confirm that you do so voluntarily, for your own purposes, with full understanding of its nature and limitations, and that you knowingly and freely assume all risk arising from such use. You are solely responsible for every decision, action or omission you make in connection with EFAS; where you act as a crew member, the pilot in command retains sole and final authority, and all information must be cross-checked against official sources. To the maximum extent permitted by applicable law, you irrevocably and unconditionally release, waive and discharge ADDIE OÜ, and covenant not to bring, join, fund or assist, any claim, demand, action, complaint or proceeding of any kind — whether past, present or future, known or unknown, in contract, tort or otherwise — arising out of or relating to EFAS, its content, its data, or any error, omission, inaccuracy, delay, interruption or unavailability, and you agree that you will not raise retroactive demands in respect of use you chose to undertake. If you use EFAS in the course of your profession, trade or business, you accept this allocation of risk as a term of use in the course of your trade or profession, to which consumer-protection rules do not apply. This provision survives termination of this agreement, deletion of your account and uninstallation of the app. It does not exclude or limit any liability that cannot be excluded or limited under applicable law (including liability for death or personal injury caused by negligence, intentional breach or gross negligence), and, if you are a consumer, your mandatory statutory rights — including under Estonian law and European Union law — remain unaffected and prevail over this provision to the extent of any conflict. Nothing in this provision limits, waives or alters ADDIE OÜ's duties or obligations toward aviation regulators or other public authorities, and nothing prevents you from reporting to, testifying before, or cooperating with any court, regulator or accident-investigation authority, or from making any report required by law.

2. Licence

The app is licensed, not sold, to you by ADDIE OÜ for use on devices you own or control, in accordance with the terms of the app store or platform through which you obtained it. Maintenance and support are provided solely by ADDIE OÜ, not by any app store or device maker. ADDIE OÜ, not any app store or platform provider, is responsible for the app and its content and for addressing any product-liability, legal, regulatory or intellectual-property claims relating to it. You represent that you are not located in a country subject to a U.S. Government embargo or designated as terrorist-supporting, and are not on any U.S. Government restricted-parties list. You may not copy, modify, reverse-engineer, resell, or redistribute the app or its bundled data except as permitted by law or by the licences applicable to its open-source components.

Apple App Store. Where you obtained EFAS from the Apple App Store, the following additional terms also apply: the app is licensed consistent with Apple's Standard Licensed Application End User Licence Agreement; Apple Inc. and its subsidiaries are third-party beneficiaries of these Terms and may enforce them upon your acceptance; Apple has no obligation whatsoever to furnish maintenance or support for the app; and if the app fails to conform to any applicable warranty, you may notify Apple, which will refund the app's purchase price (if any), Apple having no other warranty obligation with respect to the app; and your use of the app must comply with the Usage Rules set out in the Apple Media Services Terms and Conditions. The equivalent terms of any other store or platform through which you obtain EFAS apply in their place. You must also comply with any applicable third-party terms of agreement when using the app. For any claim relating to the app, contact ADDIE OÜ at the address in the footer below, or support@efas.app.

3. EFAS Pro subscription

• Core features (airport search, weather, NOTAMs) are free. Any paid tier (EFAS Pro) is offered as an auto-renewing subscription billed by the app store or platform through which you obtained EFAS, through your account with that platform.
• Payment is charged to that account at confirmation of purchase. The subscription automatically renews for the same period unless auto-renew is turned off at least 24 hours before the end of the current period; your account is charged within that 24-hour window at the then-current price.
• You manage or cancel a subscription in your platform's subscription settings (on the Apple App Store: Settings → your Apple ID → Subscriptions). Cancelling stops future renewals; the current period is not refunded by us. Refunds are handled by the platform under its terms.
• ADDIE OÜ does not process payments or store card details or payment credentials. EFAS records verified subscription transactions under your EFAS account as described in the Privacy Policy. A connected EFAS Account is required for EFAS Pro. Pricing and available features are shown in the app before purchase.

4. Data & privacy

EFAS is designed to minimise personal data and collects no directly identifying information. Devices are identified by an opaque device identifier stored in the device's secure keystore; no name, phone number, or postal address is ever requested or transmitted. Optional account binding stores only a one-way SHA-256 hash of your email address — the server never stores the plaintext address; the address is used transiently to deliver verification codes and to route the roster/OFP mail you choose to send, after which processed messages are deleted. EFAS does not request your device location and does not use GPS. The app contains no analytics, crash-reporting, or advertising SDKs. All device–server traffic is integrity-protected with HMAC chain signatures. System mail is sent from no-reply@efas.app. The data controller is ADDIE OÜ (Estonia). You may exercise your rights of access, rectification, erasure, restriction of processing, objection to processing, and data portability at any time via Settings → EFAS Account → "Delete my data" in the app, or by contacting support@efas.app, and you may lodge a complaint with the Estonian Data Protection Inspectorate (AKI). We use an email-delivery provider and a hosting provider as processors under Art. 28 GDPR agreements; where a processor is established outside the EEA, transfers are safeguarded by appropriate measures such as EU Standard Contractual Clauses. See also the Privacy Policy.

5. Data sources & licences

EFAS content is compiled and systematically updated from publicly available datasets, acknowledged in the app's About screen, including: OurAirports (CC0); AviationWeather.gov; the FAA NOTAM API; FAA JO 7340.2 (abbreviations); the US 49 CFR §172.101 Hazardous Materials Table (see §1); ERG 2024; NOAA GFS model data; Esri World Imagery and Hillshade; and community ADS-B data via adsb.lol (© adsb.lol contributors, licensed under the ODbL). Navigation data is EFAS's own compiled cycle. These sources are provided by third parties; ADDIE OÜ does not control and cannot verify their content, and they remain the property of their respective owners.

6. Disclaimer of warranties

To the maximum extent permitted by applicable law, the app and all content and services are provided by ADDIE OÜ "as is" and "as available", with all faults and without warranty of any kind. ADDIE OÜ expressly disclaims all warranties, express, implied, or statutory, including any implied warranties of merchantability, fitness for a particular purpose, accuracy, quiet enjoyment, and non-infringement, and any warranty that the data will be accurate, complete, current, uninterrupted, or error-free. No oral or written information obtained from ADDIE OÜ shall create any warranty. Some jurisdictions do not allow the exclusion of implied warranties; in that case the above exclusions apply to the fullest extent permitted.

7. Limitation of liability

To the maximum extent permitted by applicable law, and consistent with the assumption of risk and release you accepted in §1, ADDIE OÜ, its directors, employees, and agents shall not be liable for any indirect, incidental, special, consequential, exemplary, or punitive damages, or for any loss of data, revenue, or goodwill, and shall not be liable for any loss or damage of any kind arising from or in connection with any operational, navigational, or flight-planning decision made in reliance on the app, or from any error, omission, delay, or unavailability of data, whether in contract, tort (including negligence), or otherwise, even if advised of the possibility of such damages. To the maximum extent permitted by applicable law, ADDIE OÜ's aggregate liability under these Terms shall not exceed the greater of the amount you paid for the app or subscription in the twelve (12) months preceding the claim, or fifty euros (€50).

Nothing in these Terms excludes or limits liability for death or personal injury caused by negligence, for gross negligence or wilful misconduct, or for any other liability that cannot lawfully be excluded or limited. If you are a consumer, your mandatory statutory rights remain unaffected.

8. Indemnification

You agree to defend, indemnify, and hold harmless ADDIE OÜ and its officers, employees, and agents from and against any third-party claims, damages, liabilities, costs, and expenses (including reasonable legal fees) arising from: (a) your breach of these Terms; (b) your use of the app in violation of applicable law or aviation regulation, including use of the app contrary to §1 or §9; or (c) content or data you submit to the service. This obligation does not apply to the extent a claim results from ADDIE OÜ's own gross negligence or wilful misconduct, and does not limit any non-waivable consumer rights.

9. Acceptable use

You agree not to: (a) use the app as a primary or sole means of navigation, briefing, or operational decision-making, or in any manner contrary to your operator's procedures or applicable aviation regulation; (b) probe, disrupt, overload, or attempt to gain unauthorised access to the app's servers or interfere with their integrity mechanisms; (c) scrape, bulk-extract, resell, or redistribute app data except as permitted by the applicable open-data licences; (d) misrepresent app output as an official aeronautical product; or (e) use the app where or in a manner in which its use is prohibited. ADDIE OÜ may suspend or terminate access for violation of this section.

Where EFAS lets you submit or share content (for example, airport experience notes), you must not submit content that is unlawful, defamatory, harassing, misleading as to flight safety, or otherwise objectionable. Shared notes are visible to other users. ADDIE OÜ may remove or hide any submitted content, and may suspend or terminate users who submit objectionable content, without notice. You are responsible for the content you submit and grant ADDIE OÜ a licence to host, display and moderate it for the operation of the service.

10. Changes & termination

ADDIE OÜ may update the app, its content, and these Terms from time to time. Material changes will be indicated by an updated effective date and, where required, presented in the app for renewed acceptance; continued use after the effective date constitutes acceptance where permitted by law. ADDIE OÜ may modify, suspend, or discontinue the service (in whole or in part) at any time. You may terminate at any time by deleting the app; you may erase your server-side data via Settings → EFAS Account → "Delete my data". Sections 1 and 5–11 survive termination.

Severability, waiver & entire agreement. If any provision of these Terms is held invalid, unlawful or unenforceable, it shall be limited or severed to the minimum extent necessary and the remaining provisions shall continue in full force; in particular, if any part of the assumption of risk, release, or limitation of liability is unenforceable, the remainder of those protections shall apply to the fullest extent permitted by law. No failure or delay by ADDIE OÜ in exercising any right waives it. These Terms, together with the Privacy Policy and any store-specific terms that apply to you, are the entire agreement between you and ADDIE OÜ regarding EFAS and supersede any prior understanding. You may not assign these Terms; ADDIE OÜ may assign them to a successor in connection with a reorganisation, merger or transfer of the business.

11. Governing law

These Terms are governed by the laws of the Republic of Estonia, without prejudice to any mandatory consumer-protection provisions of the law of your country of habitual residence, which remain fully applicable where they afford you greater protection. Disputes shall be resolved by the competent courts of Estonia, unless mandatory law grants you the right to bring or defend proceedings in your country of residence. Consumers residing in Estonia may refer a dispute to the Consumer Disputes Committee (Tarbijavaidluste komisjon) at the Consumer Protection and Technical Regulatory Authority; consumers in other EU states retain recourse to their national alternative-dispute-resolution bodies.

12. Contact

support@efas.app