The BVLOS Opportunity
Beyond Visual Line of Sight (BVLOS) operations represent the next major frontier for the commercial drone industry. The ability to fly drones beyond the operator's direct line of sight unlocks transformative use cases: long-range pipeline inspection, large-area agricultural monitoring, remote infrastructure surveys, and emergency response across vast distances.
In Australia, the Civil Aviation Safety Authority (CASA) regulates BVLOS operations under the broader remotely piloted aircraft (RPA) framework. Gaining BVLOS approval is a rigorous process — and for good reason. An aircraft flying beyond the operator's sight needs robust systems to ensure it remains safe, predictable, and under control.
What CASA Looks For
CASA evaluates BVLOS applications based on a safety case approach. Rather than prescribing specific technical solutions, CASA requires operators to demonstrate that their overall system provides an acceptable level of safety. Key areas of assessment include:
- Navigation integrity — Can the aircraft reliably determine its position throughout the entire flight?
- Redundancy — What happens when a system fails? Are there independent backups?
- Detect and avoid — Can the aircraft avoid other aircraft and obstacles?
- Communication — Can the operator maintain situational awareness and command authority?
- Failsafe behaviour — What does the aircraft do when things go wrong?
Of these, navigation integrity and redundancy are particularly important — and particularly challenging for applicants to demonstrate convincingly.
The GPS Single Point of Failure
Most commercial drones rely entirely on GPS for navigation. This creates a single point of failure that regulators are increasingly scrutinising. If GPS fails — whether due to signal interference, multipath errors, or outright denial — a GPS-dependent aircraft loses its ability to navigate accurately.
CASA and other regulators understand this vulnerability. An application that relies solely on GPS for navigation has an inherent weakness that the safety case must address. Operators typically mitigate this by restricting operations to areas with known good GPS coverage, implementing conservative failsafe behaviours (immediate landing on GPS loss), or limiting operational range.
These mitigations work, but they also limit the operational envelope. The most compelling BVLOS applications — mining in GPS-challenging terrain, long-range rural operations, operations near sensitive infrastructure — are precisely the scenarios where GPS reliability is most questionable.
Navigation Redundancy as a Differentiator
An applicant that can demonstrate a genuinely independent navigation backup has a fundamentally stronger safety case. Not a GPS augmentation (which still fails when GPS is denied), but a completely independent system that uses entirely different principles to determine position.
This kind of redundancy changes the narrative from "what happens when GPS fails" to "the aircraft continues to navigate accurately using an independent system." It transforms GPS failure from a mission-ending event into a managed transition between navigation sources.
From a regulatory perspective, this is exactly the kind of defence-in-depth that makes a BVLOS application compelling. The aircraft does not depend on any single system or signal. It has independent, diverse navigation sources — the gold standard for safety-critical systems.
What Good Redundancy Looks Like
Not all navigation backups are created equal. For redundancy to be meaningful in a safety case, the backup system should be:
- Truly independent — it should not share any failure modes with GPS. A system that augments GPS with inertial sensors is better than GPS alone, but it still degrades when GPS is denied. A system that uses entirely different principles (such as terrain-based positioning) is genuinely independent.
- Absolute positioning — relative navigation (knowing how far you have moved) helps, but absolute positioning (knowing where you are on the Earth) is far more valuable for safe operations. It enables accurate geofencing, precise return-to-home, and reliable route following.
- Continuous — the backup should be available throughout the flight, not just as an emergency measure. Continuous operation means continuous verification — the operator can confirm that both systems agree on position during normal operations.
- Autonomous — the backup should not require ground infrastructure that might itself be unavailable. A truly autonomous system operates entirely onboard, with no dependency on external signals or ground stations.
The Australian Advantage
Australia is uniquely positioned to lead in BVLOS adoption. The country has vast remote areas where BVLOS operations deliver enormous value — mining, agriculture, and infrastructure spanning thousands of kilometres. CASA has shown willingness to approve innovative operations when the safety case is strong.
For Australian operators, investing in navigation redundancy is not just a regulatory checkbox. It is a competitive advantage. Operators who can demonstrate robust, GPS-independent navigation are better positioned to win approvals for the most valuable BVLOS missions — the ones in challenging environments where GPS alone is not sufficient.
Getting Started
If you are preparing a BVLOS application or looking to strengthen an existing approval, navigation redundancy should be a key part of your strategy. The right GPS-independent navigation system can transform your safety case from adequate to exceptional.
Bizix Aerospace builds GPS-independent navigation systems specifically for fixed-wing UAVs. Our TerrainSLAM technology provides absolute positioning without satellite dependency — exactly the kind of diverse redundancy that strengthens BVLOS safety cases. Contact us to discuss your requirements.