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Reading NMEA 2000
Connect the Smartboatia Hub directly to your boat's NMEA 2000 network. It reads the data of your existing instruments, without an additional gateway and without settings: position, speed, course, wind, depth, water temperature, air pressure, rudder angle, batteries, tanks, AIS and the state of your autopilot. The values flow automatically into the Plotter, logbook, alarms and history views. The Hub recognises your devices by manufacturer and model and shows them in the app. You do not need a subscription for this.
What you get
On board
| Where in the app | What comes from NMEA 2000 |
|---|---|
| Plotter and instruments | Position, speed and course over ground, heading, wind (apparent and true), speed through water, depth, water temperature, air pressure, rudder angle |
| Map | AIS vessels Class A and B with static data, aids to navigation (AtoN) |
| Onboard systems | Batteries (voltage, current, temperature, state of charge, battery health) and tanks (fresh water, fuel, black water) |
| Onboard systems › NMEA 2000 measurements | every value read with its last state and source, also sea state (heave), current offset and autopilot state |
| Hub Health › NMEA 2000 | List of your NMEA 2000 devices and raw data export |
| Settings › Networks › Data Sources | your devices as data sources, order can be changed |
- Reading the autopilot: The Hub detects whether your autopilot is switched on and in which mode it steers (Standby, Heading, Wind, Track, No Drift), and with many devices also the target course. Raymarine, B&G, Simrad and Lowrance are supported, as well as devices that use the NMEA 2000 standard for this. The logbook thus records when the autopilot was steering.
- You decide the source: By default your instruments on board take priority over the Hub’s GPS and barometer. Under Settings › Networks › Data Sources you set the order for each data type yourself.
- Help us get more out of your bus: Do you think your devices send data that Smartboatia does not evaluate yet? Send us a raw data export. We evaluate every export in our onboard network analysis, learn from it and gradually build new device data into the product.
Remotely
- If you connect your Hub to the cloud, you see everything it records remotely too: in the history views, the logbook and boat monitoring. This also applies to your Boat Buddies. Device list and data sources are only available on board.
Supported NMEA 2000 messages (PGN)
For dealers and technically interested people:
| Area | PGN |
|---|---|
| Position | 129025, 129029 |
| Course and speed | 129026, 128259, 129291 |
| Heading, rudder angle, sea state | 127250, 127245, 127252 |
| Wind | 130306 |
| Depth | 128267 (with transducer offset if the device sends it) |
| Water temperature | 130311, 130312 |
| Air pressure | 130314 |
| Batteries | 127508, 127506 |
| Tanks | 127505 |
| Autopilot | 127237 as well as manufacturer-specific messages from Raymarine and B&G/Simrad/Lowrance |
| AIS | 129038 to 129041, 129794, 129809, 129810 |
How it works
Connecting the Hub
- Connect the Hub to your boat’s NMEA 2000 backbone.
- Switch on the instruments. The Hub registers on the network after a few seconds and queries all devices. No setting in the app is needed.
- The first values appear immediately, and the device list fills within a few seconds.
Viewing the device list
- Open Menu › Hub Health › NMEA 2000.
- Under “NMEA 2000 Devices” your devices are listed, alphabetically by manufacturer.
- Tap a device for details such as model, serial number and software version.
Raw data export: sending data to Smartboatia
- Under “NMEA 2000 Raw Data Export” tap “Start Export”.
- The Hub records everything that happens on the bus for 60 seconds (“Recording…”).
- Tap “Share Log File” and send the file by email to our support (the address is under “Frequently asked questions” below). Briefly add which devices are on board and which values you are missing.
- You can also evaluate the file yourself in your own programs.
- It is best to export while all instruments are switched on. If your engine is connected to NMEA 2000, let it run during the export.
Devices that do not register correctly
- Some devices do not register on the network with manufacturer and address. The Hub only uses their values for the first 30 seconds. If you want to use them permanently, under Settings › Networks › Data Sources › “NMEA 2000 Sources” switch on “Allow unknown NMEA 2000 sources”. The data processing service restarts in the process.
Several devices supply the same data type
- Each device appears in the data source list as a source of its own (“Manufacturer device function via NMEA 2000”). A newly detected device is at the top and thus has priority. You can change the order by dragging, switch sources off or remove them with a long press. If the preferred source fails, the next one takes over after a short time.
Requirements
- Smartboatia Hub, connected to the boat’s NMEA 2000 network.
- Instruments on the bus switched on.
- For device list, data sources and export: app connected to the Hub.
- No internet needed, no subscription needed.
Permissions and subscription
- Subscription: fully usable without a subscription. If you use the cloud, the values also reach it faster with the Standard subscription (see Recording on board).
- On board: Everyone connected to the Hub sees values and device list and can change data sources.
- Remotely: Owner and Boat Buddies see the recorded values read only, no device or source settings.
Safety notice
- Heading from satellite compasses. The Hub takes the heading from the bus as a magnetic heading and converts it using the magnetic variation. True heading sources such as satellite compasses are currently not treated separately.
Notifications
None of their own. The values feed other features that notify you, such as the logbook and alarms.
Messages and special cases
| Situation | Message in the app |
|---|---|
| No device found | “No NMEA 2000 Devices found.” |
| Device without manufacturer information | “Unknown Device” |
| No battery or tank sensors | “Available NMEA 2000 sensors, such as batteries and tanks, will appear here.” |
| No values received yet | “No processed NMEA 2000 measurements received yet.” |
| Export already running | “An export is already in progress” |
| Export not possible | “Export failed. Please switch on the NMEA 2000 bus and the instruments and try again.” |
| Recording failed | “Recording failed. Please switch on the NMEA 2000 bus and the instruments and try again.” |
| File cannot be loaded | “Download failed” |
| Setting not saved | “Setting could not be saved. Please check the connection and try again.” |
Offline behaviour
- Reading NMEA 2000 runs entirely on board, without internet.
- After a Hub restart the device list is there again immediately. Manufacturer-specific values such as the autopilot state come back after a few seconds, as soon as the devices are detected again.
- The order of your data sources is kept across restarts.
Frequently asked questions
Do I need a gateway to connect the Hub to NMEA 2000?
No. You connect the Hub directly to your boat's NMEA 2000 backbone. It registers on the network after a few seconds, no setting in the app is needed, and you do not need a subscription.
Which data does the Hub read from the NMEA 2000 network?
Position, speed, course, wind, depth, water temperature, air pressure, rudder angle, batteries, tanks, AIS and the state of your autopilot. The values flow automatically into the Plotter, logbook, alarms and history views.
Which autopilots does the Hub recognise?
Raymarine, B&G, Simrad and Lowrance as well as devices that use the NMEA 2000 standard for this. The Hub detects whether your autopilot is switched on and in which mode it steers, and with many devices also the target course.
The values of a device disappear after a short time. What can I do?
Some devices do not register on the network with manufacturer and address, and the Hub only uses their values for the first 30 seconds. Under Settings › Networks › Data Sources › "NMEA 2000 Sources" switch on "Allow unknown NMEA 2000 sources".
Which GPS applies if my chartplotter and the Hub both have one?
By default your instruments on board take priority over the Hub's GPS and barometer. Under Settings › Networks › Data Sources you set the order for each data type yourself.
My devices send data that the app does not show. What can I do?
Send us a raw data export: Menu › Hub Health › NMEA 2000 › "Start Export", then "Share Log File" to support@smartboatia.com. We evaluate every export and gradually build new device data into the product.