Cruisers Forum
 


Reply
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 09-06-2023, 05:22   #1
Registered User

Join Date: Feb 2023
Posts: 3
Mag HDG Issue

My wind, depth and speed instruments are Raymarine Mn 100-2 wireless with a hull receiver and transmitter. As they are NMEA 0183 I use an Actisense NGW1 to pass the data into my NMEA 2000 network where the data is successfully read by the plotter. The magnetic heading is supplied from a sensor directly connected to the nmea 2000 backbone. This is primarily for the radar but the value is seen and correctly displayed on the chart plotter and by the wind instruments via the NGW1. I use a DigitalYacht Navlink 2 to supply the nmea 2000 data as 0183 to tablets and signal k/opencpn on the Raspberry Pi.
Now for the strange part. With the wind etc instruments turned off, the magnetic heading is seen by the Navlink 2 as $IIHDG,47.8,0.0,E,1.4,E*77 and is transmitted correctly to everything relying on the Navlink via the Wi-Fi router. As soon as the wind instruments are turned on this data is no longer transmitted and everything depending on the Navlink 2 displays only the last data, frozen. All equipment on the NMEA 2000 backbone sees the data correctly. There are no filters switched on the Navlink 2. One downside of this is that my own boat displays on opencpn as heading in a different direction to the COG. Iíve asked DigitalYacht if they can help given that the problem is downstream of their device but they havenít replied.
Can anyone throw any light on why this is happening and how it may be remedied please.
Vivacity is offline   Reply With Quote
Old 09-06-2023, 12:46   #2
Registered User

Join Date: Nov 2012
Location: Orust Sweden
Boat: Najad 34
Posts: 3,989
Re: Mag HDG Issue

Vivacity..
First Q and test for you:
Your HDG is reporting a magnetic heading and variation is 0.0 (good!):

Do you have the plugin WMM enabled? With you data WMM should create a true heading.
Hakan is offline   Reply With Quote
Old 09-06-2023, 23:31   #3
Registered User

Join Date: Feb 2023
Posts: 3
Re: Mag HDG Issue

Hi, thank you for your help. I do have that plug in enabled. With the Raymarine instruments mentioned above switched off the magnetic heading reads correctly in Signalk and Opencpn. From that I assume everything at that end is ok. When the Raymarine instruments are turned on the data disappears after the DigitalYacht converter.
Vivacity is offline   Reply With Quote
Old 11-06-2023, 10:39   #4
Registered User

Join Date: Jul 2012
Posts: 5
Re: Mag HDG Issue

I am using Openplotter HDM data from Pypilot for my navigation and would like Signal K to transmit the data HDM to my Simrad NMEA 0183 instruments. What Signal K commands do I need to do this?

Openplotter readily accepts all of the Simrad data (wind, speed, depth, etc) but I have been unsucessful in sending data back to the instruments.
Ssth is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
COG, true HDG, mag COG all wrong codger OpenCPN 18 19-05-2020 04:03
Multihull Mag put out decent free mag WWV Multihull Sailboats 1 16-12-2016 02:12
Custom NMEA Sentences-convert HDG in HDM Madden OpenCPN 3 25-05-2015 20:21
No HDG Data Display In OpenCPN xiurong OpenCPN 19 15-01-2014 05:46
SAIL Mag - June Issue Down2TheC OpenCPN 13 10-07-2011 11:48

Advertise Here


All times are GMT -7. The time now is 01:55.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2023, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2023, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.