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Latest Threads
RPi Voltage Stabaliser
Forum: General discussion
Last Post: Didier B
11 minutes ago
» Replies: 2
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Raspberry Pi 4 released!
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2 hours ago
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moitessier hat - AIS rece...
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4 hours ago
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OpenPlotter v2.x.x is com...
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4 hours ago
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Pypilot, can I control it...
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10 hours ago
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OP Moitessier Hat
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Last Post: StoneCrab
10 hours ago
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Tinypilot network config ...
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Tack settings
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Yesterday, 05:54 PM
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no connection from opencp...
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Yesterday, 05:10 PM
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Where can I get Magnetic ...
Forum: How do I...?
Last Post: affinite
Yesterday, 04:45 PM
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» Views: 4

  Tack settings
Posted by: rastam4n - Yesterday, 05:54 PM - Forum: General discussion - No Replies

Can someone point me to or tell me how to adjust the tack settings? The config window for pypilot in opencpn does not allow adjustment, guessing there is another spot for these?

  no connection from opencpn py.pilot plugin to OP 1.2
Posted by: rastam4n - Yesterday, 05:10 PM - Forum: General discussion - No Replies

The py.pilot plugin in opencpn does not seem to connect to openplotter1.2/pypilot. 

On the other hand it does connect to openplotter1.0/pypilot

my setup is as follows

I have openplotter on a Rpi3b+ I have enabled py.pilot. I do not yet have a motor connected so all this is a bit prelim i guess
I have a windows PC running opencpn 5.0 with the py.pilot plugins. The plugin is pointed at it connects fine using OP1.0 but does not using 1.2... also seems the signalK data is really buggy in 1.2, sometimes the data stops completely at which time I also loose VNC connection, and cannot connect till the data starts flowing again. 

For the time being I have rolled back to OP1.0 
Anyone else having issues with Op1.2 and py.pilot or basic stability of OP1.2?

  Where can I get Magnetic Variation data ?
Posted by: affinite - Yesterday, 04:45 PM - Forum: How do I...? - No Replies

Can someone tell where I can get Magnetic Variation data in real time?
I don't seem to have a device generating NMEA HDG and although I know that it is part of the NMEA RMC sentence, my GPS dongle isn't sending it.
I've tried the Variation Calculator Tool in OP but dont see any evidence of it working despite inputting a valid RMC sentence to KPLEX
Is that module working ?

I suppose I could use OP's NMEA generator to generate a HDG sentence based on my known Variation of 5 Degrees East but I wondered if this data would normally be part of downloadable data such as from GPS

(Edit - cant find HDG in the list of sentences I can generate in OP, so maybe thats a non-starter)


RPi 3b+
OP v 1.2.0

  What type of plugs do you use for rudder connection?
Posted by: syohana - Yesterday, 04:35 PM - Forum: General discussion - No Replies

Hi Sean,

I'm keeping my old autopilot as backup and would like to be able to swap the rudder connection easily as they will share the existing rudder sensor.

Seems like the nicest way to do that is put the same type of plug on the cable to the old autopilot, then I can quickly swap the plugs over.

Please could you tell me what the name/type/part number is for the rudder sensor connection plug you used?

Might be useful to know the same for the pilot-motor controller cable plugs too in case I want to add an alternative cable for the pypilot to sit either outside or at the chart table.



  OP Moitessier Hat
Posted by: StoneCrab - Yesterday, 12:51 PM - Forum: Documentation - Replies (2)

My venture into Open Plotter:  reporting problems and asking a few questions

I don't know if there is a problem with the OpenPlotter documentation or I am misunderstanding something but when installing the Moitessier hat on my Raspberry Pi3B+ at one point you need to match the Kernel to the drivers but the driver list doesn't have what is needed.  There is a link to the latest drivers.  When the drivers download, they don't go into a directory where the software sees them.  I had to manually search the directories until the other drivers were found and then I copied the downloaded file to that directory for the install.  

The destination directory that worked for me was "/home/pi/.config/openplotter/tools/moitessier_hat/packages" with the new driver located in that directory, it popped up on the list and I was able to install it.

The installation completed with an error or two, but the Pi did reboot and the hat worked after that  The terminal screen suggests that you read the log file but doesn't say where it can be found.  Anyone know where the "log" file is located?  

Once I got the Moitessier hat up and configured by going through the setup instructions, it was driving the CPN display but compass heading seems to be a suggestion rather than anything accurate based on the results of my rotation of the Pi.  The required orientation of the Pi isn't documented anywhere.  Does the Pi figure out how the module is mounted and correct itself from there?

I2C setup doesn't allow for editing of the SignalK description.  The field isn't grayed out but typing doesn't result in anything appearing in the name field.

The instructions show a tilt, roll and direction data field which looks quite interesting but my installation doesn't produce one, unless I just haven't found it yet.  Does anyone know where this screen is located?
[Image: assets%2F-L9g5MoJ9GSCaNGq_yjb%2F-LGBfW3x...3e61d10898]

Under SK Diagnostics I get an error statement:  File not found "keyswithmetdata.json".  Any idea why?

The installation onto the SD card resulted in only 6GB of the 16 being included in the partition.  This has prevented me from downloading any charts.  Can anyone tell me how to re-partition the SD card so I have full use of the space?

If you can also tell me where I went wrong in the installation, I will know not to do that in the future.  I downloaded the image and burned it to the SD card.  Noobs didn't boot for me, so I stuck to the image.

I was lucky enough to also buy a Pi4B.  While I have only had minor problems getting the 3B+'s working, the OpenPlotter installations will not work on the Pi4's.  I downloaded Raspberian from in June and didn't have any luck booting the Pi with that image, but downloaded the July version yesterday and got it running without any difficulty.  Will OpenPlotter update their version of Raspberian or should I try to build OpenPlotter on top of my working OS?  I think I read somewhere that these steps are described for a manual installation.  

For now though, my first priority is to re-partition the SD card so that I can continue making changes.  

If anyone knows the answers to my questions above, I'd appreciate your input.

  paths disappear
Posted by: hectorl2k - 07-17-2019, 01:25 PM - Forum: How do I...? - Replies (1)


I realized that if I let the server run without touching anything, the signalK paths disappear and I am forced to restart my Raspberry 

What do I have to do to keep the Paths from disappearing ?

thanks, in advance,


  Different PGNs for speed in OP and Raymarine
Posted by: wanni - 07-17-2019, 06:27 AM - Forum: How do I...? - No Replies


i set up OP Plotter on my raspi with the can-bus adapter sold by the sailoog team. Everything works fine so far (even the AIS over N2K is working now)

One problem is still not solved: I use a raymarine i50 speed display in my cockpit. i can switch between speed and SOG. the SOG is always "---" or 0.

looking in the kplex data stream and outgoing PGNs there is an PGN for SOG which is send to the network, but (from my mind, im not at the boat this month) these are different PGNs. The ones send do not match the ones accepted from raymarine. is there a possibility to match the PGNs? Or what else am I doing wrong?

best regards


  RPi Voltage Stabaliser
Posted by: lawrence_craig - 07-17-2019, 05:46 AM - Forum: General discussion - Replies (2)

Hi guys,

How are your RPi's wired to the 12v system?

I have recently had 2 x RPi's fail on me and although I don't know the root cause, I believe voltage delivery may be a potential issue.

Do any of you use voltage regulation?

Mine is currently wired via a microUSB to a USB port (5v, 2.1a) directly wired to 12v system.

Cheers in advanced.

  MDA command cannot be configured anymore
Posted by: SkipperEarly - 07-17-2019, 03:32 AM - Forum: Bug Reports - No Replies

I know that XDR is supposed to be the correct NMEA commands for e.g. barometric measures, however unfortunatly Ocpn5 has again only MDA's implemented for the toolbar.

When I now try to configure the MDA sentence in op 1.2 I cannot select in the pulldown environment.ouside.pressure - manual input is also restricted - so this is clearly a bug.

  How to test servo / arduino separately
Posted by: ironman - 07-14-2019, 04:25 PM - Forum: General discussion - Replies (4)

I have an arduino hooked up to a tinypilot and I'm getting telemetry readings. I'm planning to make an h-bridge so I hooked up digital pin 6 of the nano to ground. To see some virtual action, I tied some leds to digital pins 2, 3, 9 and 10. I'm trying to get this mock-up spinning, first trying the << and >> buttons in the autopilot ui, but the leds stay off. Then I try to set servo.command, but no cigar either. I don't have an imu yet.

So, in the context of a tinypilot image, how can I test the servo / arduino subsystem?



Attached Files
.txt   no cigar.txt (Size: 486 bytes / Downloads: 9)