Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 04-04-2016, 19:50   #1
Registered User
 
rgleason's Avatar

Join Date: Mar 2012
Location: Boston, MA
Boat: 1981 Bristol 32 Sloop
Posts: 9,421
Seeking Nmea Data files for testing.

WE need some good recorded nmea data files for testing the plugin TackandLay_pi. Specifically upwind and downwind recordings for the purpose of creating polar files and testing TnL.

We are looking for files with GPS data (position, Sog, Cog) and Wind (apparent and true) and Heading. It can have AIS in it.

What we are looking for is upwind tacking (both tacks) and downwind tacking (both tacks).

Any size file, I will advise how to upload.

Thanks.
__________________

__________________
rgleason is offline   Reply With Quote
Old 05-04-2016, 08:51   #2
Registered User
 
rgleason's Avatar

Join Date: Mar 2012
Location: Boston, MA
Boat: 1981 Bristol 32 Sloop
Posts: 9,421
Re: Seeking Nmea Data files for testing.

I believe this is the data we need at the moment to run TackandLay_pi

This is a pure guess about what data is needed by the plugin at the moment.
COG & SOG from Gps
HDG magnetic (Learned necessary -tried nmea 08.09.15A.txt)
True Wind Speed
True Wind Direction (magnetic)
STW (may not be needed for simple laylines*)
Mag HDG (may not be needed for simple laylines*)

* no set and drift calculated (leeway + current)

Still looking for upwind tacking and downwind tacking nmea files with the above data
Upwind and downwind files with apparent wind (speed, angle, direction) may also become useful with some improvements to the plugin.)
__________________

__________________
rgleason is offline   Reply With Quote
Old 05-04-2016, 13:44   #3
Registered User

Join Date: Oct 2012
Location: Brighton, UK
Boat: Westerly Oceanlord
Posts: 374
Re: Seeking Nmea Data files for testing.

Should data be timestamped and if so how? A bunch of sentences don't necessarily reflect the inter-sentence spacing.
__________________
muttnik is offline   Reply With Quote
Old 05-04-2016, 15:42   #4
Registered User
 
rgleason's Avatar

Join Date: Mar 2012
Location: Boston, MA
Boat: 1981 Bristol 32 Sloop
Posts: 9,421
Re: Seeking Nmea Data files for testing.

Muttnik,
I don't see any time stamps in the files that work.
However attached is a snippet of what I know works.
You can take the .doc of if you'd like.
I think the timing is simply set by the baud speed of the connection.
I certainly speed it up when using VDR and VDRplayer.
Attached Files
File Type: doc Hartmut-Netherlands-Leg1-veryshort .txt.doc (4.4 KB, 16 views)
__________________
rgleason is offline   Reply With Quote
Old 05-04-2016, 16:35   #5
Registered User
 
rgleason's Avatar

Join Date: Mar 2012
Location: Boston, MA
Boat: 1981 Bristol 32 Sloop
Posts: 9,421
Re: Seeking Nmea Data files for testing.

Here is a brief summary of the Nmea Sentences used.
There is timestamp data in the GLL sentence perhaps some others.
Attached Files
File Type: doc Hartmut-Netherlands-Nmea-Summary.txt.doc (4.0 KB, 13 views)
__________________
rgleason is offline   Reply With Quote
Old 05-04-2016, 21:03   #6
Moderator
 
Paul Elliott's Avatar

Cruisers Forum Supporter

Join Date: Sep 2006
Posts: 3,888
Images: 4
Re: Seeking Nmea Data files for testing.

Here is a zipped NMEA0183 logfile that I think has the type of data you are looking for. This came from the "2012 Pacific Cup Start" logfile I have on the downloads page for NavMonPc. The original file doesn't have TWS/TWA, so I had NavMonPc create these from the available data and save everything in a new logfile. The sentence types are:
MWD, MWV, HDG, HDM, RMC, HDT, HDG, VHW, VDM, DBT, VWR, MTW, GBS, VDO, and a few others.

https://drive.google.com/open?id=0B1...2l3SWktWnd0LTg

I wouldn't trust the wind angle calibration too much, but it's close enough for testing purposes. We've got COG/SOG. HDG/STW, AWA/AWS, and TWA/TWS data for your polar generation. Again, garbage in, garbage out, but it should be good enough to play with.

This is mostly upwind, but we did do a a jibe or two before the start.
__________________
Paul Elliott, S/V VALIS - Pacific Seacraft 44 #16 - Friday Harbor, WA
www.sailvalis.com
Paul Elliott is offline   Reply With Quote
Old 06-04-2016, 01:56   #7
Registered User
 
rgleason's Avatar

Join Date: Mar 2012
Location: Boston, MA
Boat: 1981 Bristol 32 Sloop
Posts: 9,421
Re: Seeking Nmea Data files for testing.

Dear Paul
I can't thank you enough! I am going to have to try creating tws/ twa from available data for some other files too. I did not realize it would help in this way. Could I filter out ais data in the same way and save the file as well?
Cant wait to try it.
__________________
rgleason is offline   Reply With Quote
Old 06-04-2016, 01:57   #8
Registered User
 
rgleason's Avatar

Join Date: Mar 2012
Location: Boston, MA
Boat: 1981 Bristol 32 Sloop
Posts: 9,421
Re: Seeking Nmea Data files for testing.

Also to use your file for tnl!
__________________
rgleason is offline   Reply With Quote
Old 06-04-2016, 06:54   #9
Registered User
 
rgleason's Avatar

Join Date: Mar 2012
Location: Boston, MA
Boat: 1981 Bristol 32 Sloop
Posts: 9,421
Re: Seeking Nmea Data files for testing.

Paul, the file (San Francisco) works very well for upwind. Thank you. I'll be posting it in the TnL thread.
__________________
rgleason is offline   Reply With Quote
Old 06-04-2016, 09:36   #10
Moderator
 
Paul Elliott's Avatar

Cruisers Forum Supporter

Join Date: Sep 2006
Posts: 3,888
Images: 4
Re: Seeking Nmea Data files for testing.

You can use the NMEA Router feature of NavMonPc to do NMEA filtering. Here's one way to modify a raw NMEA0183 logfile:

Start NavMonPc.

Play a previously recorded NMEA logfile. Set up the NMEA router to Collect all the NMEA sentence types. Set up the router to forward only the desired message types to the NMEA Log.

Once this is done, stop the playback, configure NavMonPc to record a new logfile (use a different name than the one you are playing), and restart the playback. This new logfile will contain only the NMEA sentence-types you want.

Of course there are many ways to edit an ascii NMEA logfile, but this is method is easier than it sounds.

I just did this for the previous logfile, removing the AIS stuff. Here's a link to the file:
https://drive.google.com/open?id=0B1...DFWZkhpaW44cW8
__________________
Paul Elliott, S/V VALIS - Pacific Seacraft 44 #16 - Friday Harbor, WA
www.sailvalis.com
Paul Elliott is offline   Reply With Quote
Old 06-04-2016, 12:44   #11
Registered User
 
rgleason's Avatar

Join Date: Mar 2012
Location: Boston, MA
Boat: 1981 Bristol 32 Sloop
Posts: 9,421
Re: Seeking Nmea Data files for testing.

What a great tool. I am going to modify some of the nmea data files I have accordingly, so that TacknLay will work better for testing..
__________________

__________________
rgleason is offline   Reply With Quote
Reply

Tags
nmea

Thread Tools
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
For Sale: Comar NMEA-2-WIFI NMEA 0183 Converter $230 4arch Classifieds Archive 1 02-11-2015 04:02
Multiplexing NMEA on a router (NMEA over WiFi redux) Mollymawk Marine Electronics 16 21-10-2014 06:18
Integration with QtVlm - Data files and Import/Export JesperWe OpenCPN 289 30-03-2013 10:20
Looking for GPX Files for Testing Netsurfer OpenCPN 3 10-02-2010 04:18
Load Testing and Conductance Testing Joe500 Electrical: Batteries, Generators & Solar 0 02-12-2009 16:12



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 06:00.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.