Motion Intelligence For Steering Quality

Attitude Module

Reliable motion understanding is the foundation for calm steering, earlier hazard detection and active prevention when the sea turns ugly.

Suite Overview Safety + Prevention

Why bow and stern motion both matter

Comparing bow and stern motion helps separate normal rolling from wave impact, stern lift and bow-bury tendencies.

That extra context improves the confidence of pitch, heel, yaw, force and wave-phase interpretation before those signals are used by steering and prevention logic.

Primary Outputs

Heading and rate of turn for the control loops.
Heel and pitch context for sea-state interpretation.
Signal freshness and confidence for downstream gating.
Motion trends used by the hazard predictors.
9-axis attitude vectors plus fore/aft force signatures for impact and load awareness.

Operational Robustness

Startup health checks with visible diagnostics.
A calibration flow designed for repeatable results.
Source-transition handling that avoids abrupt steering surprises.
Awareness of drift and bias during long runtimes.
Confidence-scored data handoff to prevention functions.

Bow And Aft Sensor Pair

The normal installation uses two Attitude modules: one mounted as far forward as practical and one mounted as far aft as practical.
That separation lets the system compare bow and stern motion instead of relying on one single motion point.
Fore/aft motion difference helps the system understand pitching, stern lift, bow-bury tendency and wave-phase behavior more clearly.
This is especially useful offshore, where the danger is often not just the absolute heel or pitch angle, but how the whole boat moves through the wave cycle.

Redundancy And Degraded Operation

The system is designed to handle semi-active spare Attitude modules in both bow and aft positions.
If an active bow or aft unit becomes stale, noisy or unavailable, the system can automatically switch to the spare source when confidence rules allow it.
If something more serious happens, the wider autopilot suite can still run with only one active Attitude module.
Single-module operation keeps the boat usable, but with reduced functionality: less accurate fore/aft wave interpretation, lower prevention confidence and fewer motion-comparison cues.

Sea-Danger Awareness

Surfing detection from acceleration and speed behavior.
Tracking of pitching severity and bow-bury tendency.
Sudden descending and slamming impact cues from changes in the fore/aft force signature.
Pooping-risk proxies from stern lift and wave-phase behavior.
Broaching tendency from combined heel, yaw and force dynamics.
Pitchpoling risk indicators from rapid pitch acceleration and load transfer.

These cues feed the wider prevention layer so the system can warn earlier and, when configured, take preventive action.

Open the seamanship and safety article library.

Singlehanded Benefit

Consistent attitude data reduces uncertainty when wind and sea shift at night. The skipper can trust mode behavior, spot real anomalies faster and react before dangerous wave patterns escalate.

**Attitude Diagnostics**
Heading, heel, pitch, ROT and freshness indicators.

**Sea-State Interpretation**
Motion graph used for sea-state context and control damping.

Related across the suite

Current page focus: Motion sensing and dangerous-sea awareness cues.

Bow and aft motion comparison for wave-phase context.

Prevention cues for broach, surf and pitchpole tendency.

Confidence-scored handoff to steering and safety logic.

Force signatures for impact and load-transfer awareness.

Single-module degraded operation with reduced confidence.

Roadmap: camera cues to complement attitude sensing.

Feedback And Comments

This project is still in progress, and I would genuinely like feedback on what is missing, what feels unclear, and what would be most useful offshore. The first sea trial is planned for the 2026 sailing season, and every comment is reviewed by me before it appears publicly.

No public comments yet. You can be the first to add feedback.

Built For Singlehanded Offshore Reality

These public pages focus on what the suite actually delivers offshore: steadier steering, fail-safe automation, and practical offshore support that reduces workload without taking control away from the skipper.