Engine, fuel & NMEA
Engine health and maintenance.
Health starts with hard safety limits, then groups trip data by RPM range, from idle to wide-open throttle. It learns which oil pressure, temperature, voltage and other supported readings are normal at each RPM instead of judging each number alone.
The example updates every 0.8 seconds and mimics throttle changes. Salinity compares each reading with this engine’s learned normal for the RPM range it is running in.
At idle RPM, all four compared readings match this boat’s learned normal.
At idle RPM, all four compared readings match this boat’s learned normal.
Small demonstration. These readings only show the idea. Salinity is built to compare many more NMEA 2000 readings, depending on what the boat broadcasts.
Example only. Illustrative RPM ranges and readings for an example engine, not manufacturer limits, proof of safe operation, a diagnosis, or live boat data.
Complete system index
Everything in Health.
Every tool carries its status. Available, not in current app, unproven, and roadmap never get mixed together.
Engine watch
Reference limits
Configured manufacturer-style thresholds provide an initial check for oil pressure, coolant temperature, RPM, and alternator voltage from the first trip.
Multi-engine monitoring
Watches each engine separately, with its own learned ranges and port or starboard alerts.
Trip-built normal
Learns the engine's normal readings from complete trips, separately for each RPM range from idle to wide-open throttle.
RPM-range statistics
Compares oil pressure, coolant temperature, voltage and other supported readings with what is normal for the same engine in the same RPM range.
Same-trip fallback
Uses the current trip while the boat-specific baseline is still young, so early trips are not treated like mature history.
Plain-English alerts
Explains the changed reading, likely causes, and one useful next check without PGN codes or statistics jargon.
Relationship drift
Would recognize when a reading is still inside its limit but no longer fits its usual relationship with RPM, such as more fuel burned at the same RPM. It is not built into any Salinity app.
Mechanic Live
Turns recorded irregularities into an exact event timeline, whole-system snapshot, and owner-controlled mechanic package—your boat’s diagnostic system in your pocket.
Event Memory
Keeps the recorded lead-up, first change, whole-system moment, and recovery together so a one-time problem does not have to be reproduced.
Fuel & upkeep
Fuel economy
Shows how efficiently the boat is running from the data available on the network.
Range
Combines current burn with configured tank capacity to estimate usable distance home.
Maintenance
Tracks service items against the engine hours you enter, with due-soon and overdue reminders.
Maintenance Proof
On salinity.live, your account keeps service records with engine hours, due dates and parts, and stores receipts and service photos as boat files.
Engine trends
Keeps readings and anomaly history beside the trips that produced them.
Fleet comparison
Compare baselines across boats without exposing another captain’s raw data.
Connection & diagnostics
Read-only NMEA 2000
Designed to listen through a compatible Bluetooth NMEA 2000 gateway without sending commands back to the bus.
No brand whitelist
Uses supported standard PGNs from any compatible NMEA 2000 ecosystem. Named chartplotter and engine brands are examples, not a closed compatibility list.
Live channels
Shows the GPS, depth, engine, fuel, battery, and environmental readings the boat is actually broadcasting.
Gateway diagnostics
Makes connection state, data formats, GPS source, and capture interruptions visible.
Network Doctor
Explains missing, duplicated, stale, or misassigned NMEA sources and shows which requested channels never arrived.
Screen-off capture
Native recording is designed to keep capturing boat data through an ordinary screen lock.
Why it helps aboard
A number can be inside a broad red line and still be wrong for how hard the engine is working. Salinity learns a separate normal for each RPM range, from idle to wide-open throttle, so each reading is compared with what is normal at the RPM the engine is turning.
Signed field preview