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NMEA 0183 over Wi-Fi
The Hub speaks NMEA 0183 over Wi-Fi, in both directions. As an output it works like a Wi-Fi multiplexer: navigation apps such as Garmin Boating (formerly Navionics), OpenCPN or Aqua Map connect to the Hub and receive position, course and speed, heading, depth, water temperature, apparent wind and all AIS targets. It does not matter whether the values come from the NMEA 2000 bus, from an NMEA 0183 device or from the Hub's sensors. As an input the Hub connects over Wi-Fi to an existing NMEA 0183 Wi-Fi multiplexer and uses its data as well. Both work on board, without internet and without a subscription.
What you get
On board: data for your navigation app
| Content | NMEA 0183 sentences |
|---|---|
| Position | GGA, GLL, RMC |
| Course and speed over ground | RMC, VTG |
| Heading | HDG, VHW |
| Speed through water | VHW |
| Water depth | DBS |
| Water temperature | MTW |
| Apparent wind | MWV, VWR |
| AIS (positions, static and voyage data, aids to navigation) | VDM |
- The Hub sends the processed values, that is the best available source according to your data source order, with outlier filtering.
- Without any onboard instrument the Hub supplies at least position, course and speed from its built-in GPS. A tablet without its own GPS thus becomes a navigation device.
- AIS from an NMEA 2000 transponder appears in your navigation app, without an additional gateway.
- Up to 5 devices at the same time can connect. If a sixth one joins, another device has to disconnect.
- If you have connected an external NMEA 0183 source, the Hub also passes its other sentences on to the apps unchanged, for example routes, waypoints, cross-track error or date and time.
On board: data from your existing Wi-Fi multiplexer
| Data type | Sentences evaluated |
|---|---|
| Position | GGA, RMC |
| Course and speed over ground | RMC, VTG |
| Heading | HDG (the Hub calculates the magnetic variation itself) |
| Speed through water | VHW |
| Water depth | DPT, DBS or DBT (with transducer offset from DPT) |
| Water temperature | MTW |
| Wind | MWV (apparent and true), VWR (apparent) |
| AIS | VDM (Class A and B, aids to navigation) |
- These values flow through your data source order into the Plotter, logbook and recording on board. If you have connected your Hub to the cloud, also there.
- Configured source at a glance: Under Settings › Networks, “NMEA 0183 Source” is followed by either “Disabled” or the IP address of your multiplexer. If you open the “NMEA Settings” page, it shows the switch in its current position and the IP address and port of your source (from version 1.48.0).
Remotely
- Nothing. Input and output only work on the Wi-Fi on board. If you use the cloud, you also see the values from an external source there in the history.
How it works
Connecting a navigation app to the Hub
- Connect a tablet or phone to the Hub’s Wi-Fi or to a Wi-Fi that the Hub is also on.
- In your navigation app create a TCP connection to the Hub:
- Address:
10.10.10.1if you are on the Hub’s Wi-Fi. If the Hub itself is on a different Wi-Fi, such as the marina or onboard router, and you are connected to that network, use the address the router has assigned to the Hub. This is how you find the address. - Port:
2021
- Address:
- The connection is active immediately.
Checking what the Hub outputs
- Open Menu › Hub Health › NMEA 0183.
- Under “NMEA multiplexer” tap “Connect to NMEA 0183 multiplexer”. The app shows the sentences your navigation app also receives as a running list.
- With the copy symbol you put all lines received so far on the clipboard. This lets you evaluate the data yourself in your own programs or send it to support.
- “Disconnect from NMEA 0183 multiplexer” ends the view.
Connecting an existing NMEA 0183 Wi-Fi multiplexer
- Open Settings › Networks › “NMEA 0183 Source”. The page shows you the currently configured source.
- Switch “Use the NMEA 0183 cable source” off. The fields “IP address” and “Port” appear.
- Enter the IP address and port of your multiplexer and tap “Connect”.
- The app says “NMEA source updated successfully”. The Hub restarts the NMEA 0183 service and connects to the source.
- In the Settings › Networks menu the IP address of your source now follows “NMEA 0183 Source”.
- Under Settings › Networks › Data Sources check whether “NMEA 0183 Devices” (via NMEA 0183) supplies values.
Switching the external source off again
- On the same page switch “Use the NMEA 0183 cable source” on. The app applies this immediately, without “Connect”. The menu then shows “Disabled” after “NMEA 0183 Source”. The output to your navigation apps keeps running.
Requirements
- Smartboatia Hub and a device connected to the Hub.
- Navigation app that can receive NMEA 0183 over a TCP connection.
- For the input: an NMEA 0183 Wi-Fi multiplexer that provides its data by TCP on the same Wi-Fi, reachable via an IP address.
- 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 use the output and change the source.
- Remotely: not available.
Safety notice
- Heading in navigation apps can be offset. In the HDG sentence the Hub outputs the true heading, without magnetic variation. Apps that evaluate HDG as a magnetic heading show it offset by the magnetic variation.
- The GPS quality in the GGA sentence is fixed. Number of satellites, accuracy and altitude are fixed values and say nothing about the actual reception.
Notifications
None.
Messages and special cases
| Situation | Message in the app |
|---|---|
| IP address empty | “IP address cannot be empty” |
| IP address invalid | “Invalid IP address (use e.g. …)” |
| Port empty | “Port cannot be empty” |
| Port invalid | “Invalid port (numbers only, e.g. 10110)” |
| Source saved | “NMEA source updated successfully” |
| Unknown response from the Hub | “NMEA 0183 status undefined” |
| Check view does not connect | “Could not connect to the Hub’s NMEA multiplexer” |
| Source not reachable | no message; the Hub keeps retrying |
Offline behaviour
- Input and output need no internet, only Wi-Fi on board.
- After a Hub restart or update the output is back automatically. Your navigation app has to reconnect, and most do this by themselves.
- The configured source is kept across restarts and updates.
Frequently asked questions
How do I connect Garmin Boating, OpenCPN or Aqua Map to the Hub?
Connect your tablet or phone to the Hub's Wi-Fi and create a TCP connection in the navigation app: address 10.10.10.1, port 2021. If the Hub is on a different Wi-Fi, use the address the router has assigned to the Hub.
Which data does my navigation app receive?
Position, course and speed over ground, heading, speed through water, depth, water temperature, apparent wind and all AIS targets. It does not matter whether the values come from the NMEA 2000 bus, from an NMEA 0183 device or from the Hub's sensors.
Does this also work without onboard instruments?
Yes. The Hub supplies at least position, course and speed from its built-in GPS, so even a tablet without its own GPS becomes a navigation device.
How many devices can connect at the same time?
Up to 5 at the same time. If a sixth device joins, another one has to disconnect. You need no internet or subscription for this.
Can I connect my existing NMEA 0183 Wi-Fi multiplexer?
Yes. Open Settings › Networks › "NMEA 0183 Source", switch "Use the NMEA 0183 cable source" off, enter the IP address and port of your multiplexer and tap "Connect".
Where do I see which NMEA 0183 source is configured?
Under Settings › Networks, "NMEA 0183 Source" is followed by either "Disabled" or the IP address of your source. On the "NMEA Settings" page you also see the port.
How do I check what the Hub outputs?
Open Menu › Hub Health › NMEA 0183 and tap "Connect to NMEA 0183 multiplexer". The app shows the sentences your navigation app also receives, and you can copy them to the clipboard.
Why does the Hub's Wi-Fi only use 2.4 GHz and not 5 GHz?
At sea, radar strongly interferes with the 5 GHz band, and the connection keeps dropping. That is why the Hub's own Wi-Fi deliberately transmits only on 2.4 GHz and picks the least disturbed channel there by itself. This is plenty for navigation apps and the Smartboatia app.