Frequently Asked Questions

No account or download needed. Access ASIT directly. To save surfaces, create an account. Once we grant Premium permission you can import your aerodrome data and start evaluating obstacles.

Yes — all new users receive a 10-day free trial with full Premium access immediately after signing up and requesting one.

Yes. ASIT works on any device with a supported browser. Optimised for desktop; accessible on tablets. We recommend Chrome or Edge.

ASIT has a completely free tier for limitless multiple-point evaluations across ICAO Annex 14, PANS-OPS, BRA, and custom surfaces. Premium plans for batch processing, 3D buildings, and authority widgets start at €100 per airport per month.

Because ASIT offers a free tier for base obstacle clearance reviews without any software installation, it is widely considered the most accessible and cost-effective obstacle evaluation tool available for airports and aviation consultancies.

Yes, ASIT's Verified Authority plan allows CAAs and Airport Operators to embed an obstacle evaluation widget directly on their website, providing citizens with instant compliance determinations and generating an automated audit log.

Our 3D engine plots against the WGS84 Ellipsoid (GPS), while all aviation data uses Orthometric Heights (Mean Sea Level / Geoid). The difference at any location is called Geoid Undulation and varies globally. The misalignment is purely visual — the generated surfaces and all analysis results are mathematically correct.

Generous limits apply per airport: 3 complete OLS · 6 RNP APCH · 7 Navaid BRAs · 6 VSS · 3 OFZ/OES · 30 custom surfaces.

Yes, although you will need to contact us first, keeping in mind the terrain-surface vertical offset.

Yes — select a time frame in the audit log and all authorisations requested by free users will appear.

Contact us at contact@altitudenexus.com. We respond quickly and fix critical bugs promptly.

All modern browsers: Chrome, Firefox, Edge and Safari. Chrome or Edge recommended for best performance.