INAV vs Betaflight — When to Use Each

Betaflight and INAV are both open-source FC firmware. They share some code history but have diverged into distinct tools with different strengths. The wrong choice for a GPS build results in either a frustrating experience or wasted capability.

Core Philosophy

flowchart LR
    BF[Betaflight] -->|Optimised for| M1[Manual acro flying<br/>Low latency PID loop<br/>Freestyle & racing]
    BF -->|GPS added as| M2[Emergency recovery only<br/>GPS Rescue = last resort]
    
    INAV[INAV] -->|Optimised for| N1[Navigation-first<br/>Autonomous missions<br/>Position hold, waypoints, RTH]
    INAV -->|Manual flying| N2[Supported but PID loop<br/>not as tuned as BF]

Betaflight treats GPS as a safety feature. INAV treats GPS as the primary use case.

Feature Comparison

When to Use Betaflight

• Freestyle or racing builds where PID loop quality is the priority
• Cinewhoops and proximity builds where smooth response matters more than navigation
• Builds that only need GPS as a safety net — you almost never trigger GPS Rescue, but it's there if something goes wrong
• Any build on standard 5" freestyle frames — the community tune resources (presets, Betaflight presets database) are vastly better

Betaflight GPS Rescue is functional and has improved significantly through 4.3/4.4 — but it's not designed for reliable autonomous navigation. It's a "get the quad home before the battery dies" feature.

When to Use INAV

• GPS explorers / long-range builds where you want the quad to actually navigate autonomously
• Waypoint mission flying — INAV can fly a pre-programmed route, hold altitude, and return home without RC control
• Fixed-wing hybrids — INAV supports stabilized fixed-wing flight and mixing
• Builds where you want POSHOLD — the ability to release sticks and have the quad sit still in 3D space without drifting
• Cinematic work with a gimbal — INAV's position/altitude hold makes smooth dolly shots possible without constant correction

Adding GPS to a Pavo20

The Pavo20 (Pro / Pro II) is a 2.2" ducted digital cinewhoop — 3S power (LAVA 1104 7200 KV motors on Gemfan 2218 tri-blades), a DJI O3/O4/O4 Pro or Walksnail HD air unit, and no GPS from the factory. There is no analog, no 1S, no built-in navigation. Pilots who want GPS Rescue bolt on a micro GPS module (and usually a buzzer) themselves — and that retrofit is where the trouble starts:

flowchart TD
    P1[Small ducted frame<br/>~70-110 g AUW] -->|Low inertia| C1[GPS Rescue corrections<br/>overshoot and oscillate]
    P2[Ducted props<br/>high static thrust, high drag] -->|Sluggish response<br/>to nav commands| C2[Rescue turns are soft,<br/>not crisp]
    P3[Tiny add-on GPS module<br/>short antenna, tight bay] -->|Slow fix<br/>weak signal| C3[Poor position accuracy]
    P4[ESC BEC harmonics<br/>on the 5V rail] -->|Noise couples into<br/>the GPS module| C4[Fix drops out<br/>under throttle]

The one people miss is P4: the AIO's BEC switches at a frequency whose harmonics land right on the GPS module's supply rail and leak into its RF front-end, so the fix degrades exactly when you spool the motors up. (I'm chasing this noise on my own Pavo20 — there'll be a separate write-up on hunting it down and killing it.)

INAV's navigation stack handles the flight side of a rescue better because it uses a proper position controller (rather than a rough emergency mode), and its RTH sequence includes deceleration and braking. INAV also has better barometer integration for altitude hold on builds without a solid GPS altitude lock — but note that none of this fixes a noisy GPS fix; that's a hardware problem (see below).

Migrating a Pavo20 to INAV:

• The Pavo20's F4 2-3S AIO must have an INAV target — verify against the INAV target list
• Expect to re-tune PIDs from scratch — INAV defaults are tuned for heavier GPS builds
• Sort out the GPS power noise first; INAV can't navigate on a fix that vanishes under throttle

Signal Quality Affects Both Firmware

Regardless of firmware, GPS performance on small builds suffers from:

On a compact build the dominant problem is power-rail noise, not just the antenna environment. The AIO's ESC BEC (the switching regulator that makes 5V) throws off harmonics that couple straight into an add-on GPS module sharing that rail — so the fix weakens or drops the instant you throttle up. The 5.8 GHz digital air unit sitting centimetres away piles RF desense on top. Neither is something firmware can fix — both are hardware problems.

Hardware mitigations:

• Power the GPS from a clean/filtered 5V source, not straight off the noisy ESC BEC rail — an LC filter or a small separate low-noise regulator makes the biggest difference
• Keep the GPS antenna as far from the air-unit antenna as the frame allows
• Use a shielded GPS module (metal can lid over the module)
• Confirm the fix on the bench at throttle, not just at idle — the noise only shows up under load

Summary Decision

flowchart TD
    Q1{Primary goal?} -->|Fly fast / smooth<br/>acro / racing / freestyle| BF[Use Betaflight]
    Q1 -->|Autonomous<br/>navigation / missions| INAV[Use INAV]
    Q1 -->|GPS safety net only<br/>still flying manually| Q2{Build size?}
    Q2 -->|5 inch or larger| BF
    Q2 -->|Sub-250g micro| Q3{GPS Rescue<br/>actually important?}
    Q3 -->|Nice to have| BF[Betaflight BF GPS Rescue<br/>works well enough]
    Q3 -->|Critical for safe recovery| INAV[INAV RTH is more reliable<br/>on small GPS builds]

For most freestyle and racing builds: Betaflight.
For GPS-dependent navigation, long range, or autonomous missions: INAV.
For a Pavo20 where GPS recovery reliability matters: consider INAV, accepting the manual flying trade-off.

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