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Sending Hub sensors to NMEA 2000
The Hub comes with sensors of its own: barometer, motion sensor, voltage measurement and GPS. If it is on the NMEA 2000 bus, it makes their values available to your other devices on board. Your chartplotter or instrument display then shows air pressure, heel, trim and supply voltage, even if no sensor of its own is installed on board for them. The Hub's position serves as a backup for your onboard GPS. You can switch each value on and off individually in the app. Everything is on by default.
What you get
On board
| Value from the Hub | What your devices on the bus get from it |
|---|---|
| Air pressure | a new value on your chartplotter: the current air pressure from the Hub’s barometer |
| Attitude | heel and trim for displays that show attitude data |
| Supply voltage | a new value: the voltage measured by the Hub for displays that show general voltage values |
| Position | a backup: an additional position source in case your onboard GPS fails. The Hub’s GPS is actually there for monitoring: anchor watch, geofencing at the berth and boat monitoring work with it even with the instruments switched off (see Own sensors and calibration). |
- Air pressure trend and storm warning are shown by the Smartboatia app. For judging the weather on board, the trend counts, not the single value. The Plotter shows the current air pressure.
- The Hub sends independently of the app. Even if no phone is connected, your devices get the values.
Remotely
- Nothing. The feature only works on board between the Hub and the bus.
How it works
- Connect the app to the Hub (over its Wi-Fi or a shared Wi-Fi, see connected to the Hub).
- Open Settings › Networks › “Hub Data to NMEA 2000”.
- Flip the switch for the value you want: GPS, Speed Over Ground, Course Over Ground, Atmospheric pressure, Attitude, Battery Voltage. The Hub applies the change immediately and keeps it across restarts and updates.
- On your chartplotter select the Hub source if it does not take it automatically.
Requirements
- Smartboatia Hub on the NMEA 2000 bus, bus with power and terminators.
- For switching: app connected to the Hub.
- No internet needed, no subscription needed.
Permissions and subscription
- Subscription: fully usable without a subscription. A subscription changes nothing about this feature.
- On board: Everyone connected to the Hub can change the switches.
- Remotely: The switches are not reachable.
Notifications
None.
Messages and special cases
| Situation | Behaviour |
|---|---|
| Hub not on the bus or bus without voltage | The Hub silently retries every few seconds. No message in the app. |
| GPS without a valid position | Position disappears from the bus until a valid position is available again. |
| Sensor fails | The value disappears from the bus. |
| Page opened before the Hub has answered | All switches briefly appear as off. |
Offline behaviour
- Runs entirely on board, without internet and without the app.
- Your switch positions are kept across restarts and updates.
- After a Hub restart it sends again after a few seconds. If your chartplotter remembers sources by bus address, you may have to select the Hub source again afterwards.
Frequently asked questions
Can my chartplotter show air pressure, heel and supply voltage from the Hub?
Yes. If the Hub is on the NMEA 2000 bus, it makes the values of its own sensors available to your other devices, even if no sensor of its own is installed on board for them. The Smartboatia app shows you the air pressure trend and the storm warning.
How do I switch individual values on or off?
Under Settings › Networks › "Hub Data to NMEA 2000" you flip a switch for each value. Everything is on by default, and the Hub keeps your choice across restarts and updates.
Does the app have to be running for the Hub to send?
No. The Hub sends independently of the app and without internet; your devices get the values even without a connected phone.
My chartplotter does not show the values from the Hub. What can I do?
On your chartplotter select the Hub source if it does not take it automatically, and check whether your bus has power and terminators. After a Hub restart you may have to select the source on the chartplotter again.
What does the Hub send its position for?
As a backup: an additional position source in case your onboard GPS fails.