Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 24-06-2019, 04:08   #1
Registered User

Join Date: Feb 2019
Posts: 50
AIS causes GPS oddity.

I finally took OpenCPN on the water ... and everything worked as expected, except when I connect the AIS aerial.



I'm running with the Moitessier HAT and connecting the AIS antenna works fine and it receives an AIS broadcast, at which point plotter location returned to somewhere off the African coast (I'm assuming 0,0) .. curiously the location text in the bottom left of the window appears to remain correct.


The GPS status widget shows no satellites ... unplug the AIS receiver and a short while later it all looks good again.


AIS data looks good, I can see vessel names, MMSIs etc .. but the GPS data is screwed ... disconnect the AIS antenna and within seconds the GPS comes back ...



Does OpenCPN log this stuff? I tried doing a NMEA debug grab, but I don' think I succeeded in saving it ...no kbd to enter a file name.
__________________

rszemeti is offline   Reply With Quote
Old 24-06-2019, 04:22   #2
Registered User

Join Date: Nov 2007
Location: Probably in an anchorage or a boatyard..
Boat: Ebbtide 33' steel cutter
Posts: 4,568
Re: AIS causes GPS oddity.

Quote:
Originally Posted by rszemeti View Post

Does OpenCPN log this stuff? I tried doing a NMEA debug grab, but I don' think I succeeded in saving it ...no kbd to enter a file name.
SignalK can log, set it up in the sigK server/connections



Quote:
1561375190835;N;$GPRMC,111950.000,A,3701.2900,N,00 756.6805,W,0.0,0.0,240619,,,A*78
1561375190029;N;$GPGGA,111950.000,3701.2900,N,0075 6.6805,W,1,08,1.0,0.9,M,52.7,M,,0000*42
1561375190038;N;$GPVTG,0.0,T,,M,0.0,N,0.0,K,A*0D
1561375191185;N;$GPGLL,3701.2900,N,00756.6805,W,11 1950.00,A,A*77
1561375191186;N;$GPGSA,A,3,16,20,21,25,26,27,29,31 ,,,,,1.7,1.0,1.4*39
1561375191186;N;$GPGSV,3,1,09,31,51,193,42,25,13,1 11,37,20,12,140,32,26,67,334,35*7B
1561375191187;N;$GPGSV,3,2,09,21,68,105,44,27,24,2 58,31,16,39,312,32,23,04,295,33*71
1561375191187;N;$GPGSV,3,3,09,29,23,053,36*49
1561375191421;N;$GPRMC,111951.000,A,3701.2900,N,00 756.6805,W,0.0,0.0,240619,,,A*79
1561375191457;N;$GPGGA,111951.000,3701.2900,N,0075 6.6805,W,1,08,1.0,0.9,M,52.7,M,,0000*43
1561375191465;N;$GPVTG,0.0,T,,M,0.0,N,0.0,K,A*0D
1561375192113;N;$GPGLL,3701.2900,N,00756.6805,W,11 1951.00,A,A*76
1561375192121;N;$GPGSA,A,3,16,20,21,25,26,27,29,31 ,,,,,1.7,1.0,1.4*39
1561375192739;N;$GPRMC,111952.000,A,3701.2900,N,00 756.6805,W,0.0,0.0,240619,,,A*7A
1561375192746;N;$GPGGA,111952.000,3701.2900,N,0075 6.6805,W,1,08,1.0,0.9,M,52.7,M,,0000*40
1561375192751;N;$GPVTG,0.0,T,,M,0.0,N,0.0,K,A*0D
1561375197955;N;$GPGLL,3701.2900,N,00756.6805,W,11 1952.00,A,A*75
1561375197955;N;$GPGSA,A,3,16,20,21,25,26,27,29,31 ,,,,,1.7,1.0,1.4*39
1561375197967;N;$GPRMC,111953.000,A,3701.2900,N,00 756.6805,W,0.0,0.0,240619,,,A*7B
__________________

conachair is online now   Reply With Quote
Old 24-06-2019, 12:02   #3
Registered User

Join Date: Feb 2019
Posts: 50
Re: AIS causes GPS oddity.

OK, I shall have to wait until I am on the boat again .. or at least in range of some AIS, there is none around these parts.
rszemeti is offline   Reply With Quote
Old 01-07-2019, 14:23   #4
Registered User

Join Date: Nov 2015
Location: Ireland
Posts: 259
Re: AIS causes GPS oddity.

Quote:
Originally Posted by rszemeti View Post
Does OpenCPN log this stuff? I tried doing a NMEA debug grab, but I don' think I succeeded in saving it ...no kbd to enter a file name.

Install the VDR plugin, it'll record all NMEA traffic to a file for you.


Aedan
AedanC is offline   Reply With Quote
Old 01-07-2019, 14:48   #5
Registered User
 
Reefmagnet's Avatar

Join Date: May 2008
Location: puɐןsuǝǝnb 'ʎɐʞɔɐɯ
Boat: Nantucket Island 33
Posts: 3,536
Re: AIS causes GPS oddity.

Check your wiring and connections. It sounds like a ground loop issue.
Reefmagnet is online now   Reply With Quote
Reply

Tags
ais, gps

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
Ahoy there from the crew of SV Oddity SVOddity Meets & Greets 10 10-04-2018 15:07
Solar Controler vs. Lightning - an Oddity? barnakiel Electrical: Batteries, Generators & Solar 20 30-10-2016 20:17
VHF units with AIS/GPS or dedicated AIS EmeraldCoastSailor Marine Electronics 4 19-03-2015 17:36
AIS AIT2000 from Digital Yachts with GV30 GPS+AIS Antenna SFH Marine Electronics 1 16-02-2014 16:19
Nautical Oddity Live Aboard hummingway Liveaboard's Forum 2 05-03-2012 09:05



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 05:53.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2019, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.