The essentials in 30 seconds
- NKE Gyropilot 3 = French IMOCA/Class40 heritage. French computer, 3D wind sensors, native polars integration. French offshore racing standard since the 2000s. Compatible with almost all hydraulic rams.
- B&G H5000 = RORC international standard, America’s Cup. Hydra (entry-level) or Performance (pure racing) CPU, ultra-fine integration with WS720/WS730 ultrasonic 3D, real-time laylines and polars.
- Philosophy difference: NKE = open system (third-party central integration, Madintec MAD Brain). B&G = locked-in ecosystem (Zeus + H5000 + WS720 + Triton²).
- Complete system budget: NKE Gyropilot 3 + sensors = ~ €8,000–12,000 ex. VAT. B&G H5000 Performance CPU + sensors = ~ €6,500–9,500 ex. VAT. Premium justified by NKE’s racing flexibility.
- Workshop verdict: IMOCA / Class40 / Mini = mostly NKE. IRC / RORC / America’s Cup = mostly B&G. Performance cruising = B&G (Zeus 3S integration better for non-specialist users).
Racing autopilots are not upgraded cruising autopilots. They are integrated systems that optimize response based on the boat’s polars, true wind angle, 3D swell, and real-time calculated layline. Two ecosystems dominate this performance segment: NKE Marine Electronics and B&G H5000.
This article distinguishes the two philosophies, presents the core components, and provides a verdict by racing program. For the choice of the underlying hydraulic ram, see hydraulic vs electromechanical ram — which to choose for your sailboat.
The two philosophies — open vs integrated
Two approaches have opposed each other for 20 years in offshore racing:
- NKE = open system. The Gyropilot 3 computer is compatible with almost all rams on the market (Raymarine, Lecomble & Schmitt, Simrad DD), all wind sensors (NKE 3D HR II, B&G WS720, Calypso ultra-compact), and all attitude sensors (NKE Motion, Madintec MAD Sensor Motion). This flexibility is the signature of French offshore racing since the 1990s.
- B&G = locked-in ecosystem. The H5000 CPU natively communicates with B&G sensors (WS720/WS730), Triton² and 30/30 displays, Zeus 3S chartplotter, and Precision 9 compass. Everything works together with ultra-fine software integration, but it’s difficult to leave the ecosystem.
The choice depends on the program: pure racing open to custom solutions (IMOCA, Class40) favors NKE. IRC + performance cruising favors B&G.
NKE Gyropilot 3 — technical details
NKE Marine Electronics (Hennebont, France) equips the vast majority of French IMOCA, Class40, Mini, and Figaro boats. The Gyropilot 3 is the central computer of the ecosystem, launched in 2018 (3rd generation).
- Ram compatibility: universal via MAD Controller interface from Madintec, or direct on NKE rams.
- Nominal sensors: NKE 3D HR II (wind), NKE Motion (attitude sensor), NKE Speed/Depth, NKE Compass.
- Polars: real-time integration, target VMG calculation, projected layline with configurable safety margin.
- Software: NKE Toplink + Multigraphic display for configuration and real-time monitoring.
- Specific pilot modes: "True Wind", "Apparent Wind", "Compass", "Wave" (3D swell control). The Wave mode is one of the market references for rough seas.
B&G H5000 — technical details
The H5000 is B&G’s performance sailing ecosystem, launched in 2013, mature in 2024.
- Hydra CPU (~ €1,139 ex. VAT): entry-level, performance cruising and club-level IRC racing.
- Performance CPU (~ €2,899 ex. VAT): serious IRC racing, RORC, fine polars.
- Hercules processor (~ €2,908 ex. VAT): America’s Cup, ultra-fast layline calculation, high-end sensor integration.
- Nominal sensors: WS720/WS720S/WS730S ultrasonic 3D, Triton² displays, Precision 9 compass/attitude sensor.
- Zeus 3S integration: 12–16" Zeus 3S chartplotter displays polars + layline + true wind in overlay on the chart. European IRC racing standard.
3D wind sensors — performance differential
The wind sensor is the #1 quality criterion for autopilots. See our sailboat anemometer comparison.
- NKE 3D HR II: vertical ultrasonic 3D, 10 Hz frequency, ±0.3° accuracy, native NKE Toplink integration.
- B&G WS720S Ocean spec: vertical ultrasonic 3D 1.05 m, 10 Hz, ±0.3° accuracy, native H5000 integration.
- B&G WS730S Ocean spec: vertical ultrasonic 3D 1.4 m, 20 Hz, ±0.3° accuracy + barometric pressure sensor.
On the water, both sensors are equivalent in pure performance. The difference lies in downstream software integration: NKE Toplink for sharp racing visualization; B&G H5000 + Zeus for performance cruising user integration.
Technical comparison table
| Criteria | NKE Gyropilot 3 | B&G H5000 Performance CPU |
|---|---|---|
| CPU price ex. VAT | ~ €3,500 | ~ €2,899 |
| Ram compatibility | Universal | B&G nominal, others via N2K |
| Recommended wind sensor | NKE 3D HR II | WS720S / WS730S |
| Control loop frequency | 10 Hz | 10–20 Hz |
| Wave mode (3D swell) | Yes (market reference) | Yes (since 2022) |
| Real-time layline | Yes (Toplink) | Yes (Zeus 3S overlay) |
| Integrated polars | Yes (manual or ORC edit) | Yes (edit + ORC import) |
| Dominant ecosystem | IMOCA, Class40, Mini, Figaro | IRC, RORC, America’s Cup |
| User software | NKE Toplink | B&G app + Zeus 3S |
| After-sales France | Hennebont (NKE direct) | B&G FR network |
Workshop verdict by program
IMOCA / Class40 / Mini / Figaro / French offshore racing
NKE Gyropilot 3 is the majority choice (80% of French racing fleet). Madintec MAD Brain Box integration for automated strategy. Complete system budget ~ €12,000–18,000 ex. VAT installed.
IRC / RORC / international offshore racing
B&G H5000 Performance CPU is the majority choice. Zeus 3S 12–16" integration for helm recall of heading/layline/polars. Budget ~ €8,000–12,000 ex. VAT.
America’s Cup
B&G Hercules (processor superior to H5000 Performance CPU). Complete system budget ~ €20,000–40,000 ex. VAT (including high-end sensors).
Performance cruising (35–50 ft non-racing)
B&G H5000 Hydra CPU + Zeus 3S + WS320 = ~ €5,500–7,000 ex. VAT. More than sufficient for club regattas and offshore cruising.
Madintec + third-party integration
The NKE ecosystem opens widely to Madintec:
- MAD Brain Box (€3,950 ex. VAT): advanced navigation processor, automated strategy calculation.
- MADBrain Super-pilote (€6,000 ex. VAT): performance autopilot software.
- MADBrain Wind (€825 ex. VAT): real-time atmospheric wind calculation.
- MAD Controller (€2,550 ex. VAT): universal ram controller.
On the B&G side, third-party integration is more limited — the price of the locked-in ecosystem. Possible via NMEA 2000 (third-party sensors) but loss of fine software integration.
FAQ — Racing autopilot in practice
Is NKE compatible with B&G rams?
Yes via the Madintec MAD Controller interface. The Gyropilot 3 can drive B&G T1/T2 hydraulic rams without issue. This is the open flexibility of NKE.
Can you migrate from B&G H5000 to NKE mid-season?
Heavy work. CPU + wind sensors + displays must be replaced. Allow 15–25 days of yard work + €8,000–12,000 ex. VAT in hardware. Prefer migrating between two off-seasons.
NKE vs B&G Wave mode — real difference?
NKE Wave mode has been the reference since 2010, fine-tuned over decades of IMOCA racing. B&G caught up in 2022 with its own algorithm. In practice, NKE retains a slight advantage in rough tropical seas (already well-worked), while B&G excels in the English Channel/short seas.
Polars: manual edit or ORC import?
Both systems accept ORC (.pol) import. Manual editing is recommended after each sail for fine calibration (correcting real-world bias). NKE Toplink and B&G app both save polars by point of sail and conditions.
What battery for autopilot in a transatlantic?
The autopilot draws 2–4 A continuously while cruising, 4–8 A in rough racing conditions. Over 14 days = 1,000–3,000 Ah cumulative. See our article on lithium bank sizing. Allow a minimum of 400 Ah usable capacity dedicated to autopilot + services.
3 real-world workshop cases — performance autopilot choice
Case 1 — IMOCA Initiatives-Cœur, 2024 refit
Complete NKE Gyropilot 3 system: NKE 3D HR II wind sensor + NKE Motion attitude sensor + NKE Multigraphic display. Paired with Madintec MAD Brain Box for automated strategy + MADBrain Modes Super-pilote. Hardware budget ~ €22,000 ex. VAT (labor not included). Wave mode configured for non-stop Cape Horn transatlantic — confirmed performance at 1,200 rudder cycles/hour in rough seas.
Case 2 — Class40 Crédit Mutuel (performance cruising)
Mix of B&G H5000 Performance CPU + WS720S sensors + 12" Zeus 3S display. Autopilot natively managed by H5000, ORC polars imported, real-time layline on Zeus. Total install ~ €15,000 ex. VAT. Validated at Rolex Fastnet 2025: autopilot performance equivalent to NKE in the English Channel.
Case 3 — First 36.7 club racing IRC
Mid-range solution: H5000 Hydra CPU (~ €1,140 ex. VAT) + wireless WS320 (~ €449 ex. VAT) + Triton² displays. Total system ~ €4,200 ex. VAT. Aix Cup 2025 regatta: autopilot standard held at 100% in match racing without crew intervention.
Excluded alternatives — non-retained solutions
- Raymarine Evolution: excellent for comfort cruising, insufficient for racing. Lacks fine polars + layline calculation. Good for coastal and comfortable offshore cruising, not for regattas.
- Garmin Reactor 40: designed for big-game fishing and motor yachting. Decent sailing performance in cruising, but unsuitable for serious racing beyond club-level IRC.
- DIY autopilot with Arduino/Raspberry: technically interesting DIY projects, but no marine certification, no after-sales, no pro sensor integration. For hackers only, not for offshore safety.
- GPS-only autopilot (no compass): calculated from GPS track = inherent 5–10 second delay. Unusable for pure racing.
2026 updates — what’s new at NKE and B&G
- NKE: Gyropilot 3 firmware update March 2026 adds "Stabilized True Wind" mode to filter short gusts — useful for watch rotations to stabilize the helmsman’s feel.
- B&G: introduction of H5000 v3.5 with WindOpt polar import (proprietary algorithm that adjusts the polar based on the boat’s historical sea state). Free upgrade available for existing Performance CPUs.
- Hercules processor: planned 2027 evolution toward wind + current + swell integration ("true absolute wind" calculation compensating for local current measured by differential GPS).
Skysat distributes B&G, NKE Marine Electronics, and Madintec. This article reflects our experience from 30+ performance autopilot installations 2020–2026. 2026 ex. VAT prices are indicative distributor pricing.
