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Data source priority and data processing
If several devices on board supply the same type of data, for example two GPS units or two wind sensors, the Hub automatically decides which value applies. You set the order for each data type in the app by dragging, and you can switch individual sources off. If the preferred source fails for a few seconds, the next one takes over. When the better source sends again, it applies again. In addition the Hub filters out obvious measurement errors (GPS jumps, wind spikes, air pressure jumps), converts the magnetic heading to true and calculates the ground wind from it.
What you get
On board
- One value per data type from the best available source, in all displays, in the logbook and in the recording.
- Automatic switching without you doing anything when a device fails.
- Fewer false readings: no position jumps, no wildly turning course over ground in the harbour or at anchor, no wind spikes. The Hub does not store detected measurement errors.
- True heading even with a purely magnetic compass, without you having to enter the magnetic variation.
- Ground wind (speed and direction) as soon as wind sensor and GPS are there, even if your instruments do not calculate it themselves.
- Total distance of the boat as a running distance counter.
- Overview in the settings: which devices supply which data type. Grey means: silent for 30 minutes.
Remotely
- If you use the cloud, the values arrive there already selected and cleaned. You can only set the sources on board.
How it works
Setting the order
- Connect the app to the Hub (over its Wi-Fi or a shared Wi-Fi, see connected to the Hub).
- Open Settings › Networks › Data Sources. For each data type you see the known sources, the preferred one at the top.
- Changing the order: drag a source by the handle symbol on the left.
- Switching a source off or on: switch on the right.
- Removing a source: press and hold the name and confirm “Delete”. If the source sends again later, it appears at the top of the list. You can only switch off the Hub’s built-in sensors, not remove them.
- Changes apply immediately. Pulling down reloads the list.
Data types in the list: GPS position, speed over ground, course over ground, wind, heading, speed through water, water depth, water temperature, air pressure.
What the sources are called
| Source | Name in the app |
|---|---|
| Built-in sensors of the Hub (GPS, barometer) | “Smartboatia Hub”, built-in sensors |
| All devices on the NMEA 0183 input together | “NMEA 0183 Devices”, via NMEA 0183 |
| Each detected NMEA 2000 device individually | Manufacturer and device function, for example “Garmin GPS”, via NMEA 2000 |
| Devices without an identifier | “Unknown Devices” |
Allowing unknown NMEA 2000 devices: see Reading NMEA 2000. The switch is at the bottom of the same page.
Order and switching times
When a device reports for a data type for the first time, the Hub puts it at the top of the list, and the previous sources move down. The Hub’s built-in sensors are in the list from the start. Your onboard devices therefore take priority over the Hub’s GPS and barometer, a newly connected NMEA 2000 GPS immediately. If you do not like that, drag it down.
| Data type | Priority | Switching after |
|---|---|---|
| GPS position, speed and course over ground | most recently detected device, excluding the Smartboatia Hub’s own device | 5 seconds without a value |
| Heading, wind, water depth | most recently detected device | 5 seconds |
| Speed through water | most recently detected device | 10 seconds |
| Water temperature | most recently detected device | 5 minutes |
| Air pressure | most recently detected device, excluding the Smartboatia Hub’s own device | 5 minutes |
Requirements
- Smartboatia Hub.
- For setting: app connected to the Hub.
- For ground wind: wind sensor and GPS, for the direction at anchor also a compass.
- 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 data sources.
- Remotely and in phone mode: no settings.
Safety notice
- Heading from satellite compasses. The Hub always treats heading from the NMEA 2000 bus as magnetic. True sources such as satellite compasses are currently not treated separately, and the Hub does not take into account deviation at the mounting location.
- Depth as your echo sounder supplies it. The Hub has no correction values of its own for depth and calculates no depth under keel. Whether the depth applies from the waterline, the transducer or the keel, you set on the echo sounder.
Notifications
None. Switching, failure of a source and filtered-out measurement errors trigger no message.
Messages and special cases
| Situation | Message or behaviour |
|---|---|
| Data type without a source | “No available sources.” |
| Confirmation when removing | “This removes the source from the priority list. If it comes back, it will be added to the top of the list again.” |
| Switch for unknown devices not saved | “Setting could not be saved. Please check the connection and try again.” |
| Removed source sends again | appears at the top of the list |
Offline behaviour
- Everything runs on the Hub, without internet.
- Your order is kept across restarts and updates.
- In the first seconds after a restart a lower-ranked source may briefly apply until the preferred one has sent.
- The distance counter keeps running after a restart.
Frequently asked questions
I have two GPS units on board. Which one does the Hub use?
The device at the top of the list. The Hub puts a newly detected device at the top of the list; you change the order under Settings › Networks › Data Sources by dragging the handle symbol.
What happens if my preferred device fails?
The next source then takes over automatically, for GPS after 5 seconds without a value. When the better source sends again, it applies again.
Do I have to enter the magnetic variation?
No. The Hub converts the magnetic heading to true itself. It always treats heading from the NMEA 2000 bus as magnetic, also from true sources such as satellite compasses.
Does the Hub calculate the ground wind?
Yes, as soon as wind sensor and GPS are there, even if your instruments do not calculate it themselves. For the direction at anchor you also need a compass.
Why is a source grey in the list?
Grey means the source has sent no data for 30 minutes.
Can I remove a source?
Yes, press and hold the name and confirm "Delete". If it sends again later, it appears at the top of the list; you can only switch off the Hub's built-in sensors.