FIG. 01 — TRANSIT THROUGH A DENIED CORRIDORRED — GNSS DENIAL AMBER — SEXTANT TRACK
Sextant is a bolt-on navigation module that keeps a small uncrewed aircraft on mission when GNSS is jammed, spoofed, or gone. It computes position onboard from what its cameras see — emitting nothing, depending on nothing, and declaring the moment its own fix degrades.
One sealed unit on the belly of the aircraft: stereo cameras, an inertial unit, and a mission computer. It watches the ground move past, measures the aircraft’s own motion, and solves position continuously — the way a pilot does, with instruments instead of satellites.
Passive stereo vision plus inertial sensing. No RF received, none transmitted — nothing for an EW operator to find, jam, or spoof.
The fix is computed on the module itself and fed to the autopilot as a standard position stream. PX4, ArduPilot, Cube-class stacks — no rework of your aircraft.
Every fix carries a live trust measure. If the estimate degrades, the aircraft knows — and executes a defined action instead of drifting on a lie.
Light, low-power, low-cost. Built for Group 1 and attritable platforms — not just the exquisite ones.
Twin cameras track thousands of ground features as they stream past; the inertial unit measures every acceleration and turn.
Vision and motion are fused into a continuous position, velocity, and heading — computed entirely onboard, satellites not consulted.
The estimate is audited in real time. Degrading confidence triggers a defined response: hold, reroute, return, or land.
The autopilot receives the fix exactly as it would GNSS. Your aircraft flies its mission; it never knows the satellites left.
Sextant is a payload, not a platform. It mounts to the belly rail of the aircraft you already operate and integrates in a day over a single connector.
Accuracy, envelope, and endurance are measured, improving, and deliberately unpublished. Performance data is disclosed to qualified UK partners under NDA, against the platform you intend to fly.
For UK integrators and defence platform builders who need aircraft that keep flying when the spectrum turns hostile.
Request a briefingjonathan@apricotstudio.co