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RMB sentence shows wrong waypoint name

  • dwarning
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1 year 6 months ago #1488 by dwarning
RMB sentence shows wrong waypoint name was created by dwarning
Hello,
I found a problem with the qtVlm (V.: 5.10-8) generated RMB sentence. The place for starting and destination waypoint name is mistaken:

$GPRMB,A,0.00,R,myBoat,POI12,5226.124,N,01340.598,E,3.4,133.2,0.0,V,A*3E

Here myBoat is the starting place and POI12 the first waypoint, or destination.

From standard:RMB - Recommended Minimum Navigation Information                                                             14
        1 2   3 4    5    6       7 8        9 10  11  12  13|
        | |   | |    |    |       | |        | |   |   |   | |
 $--RMB,A,x.x,a,c--c,c--c,llll.ll,a,yyyyy.yy,a,x.x,x.x,x.x,A*hh<CR><LF> Field Number: 
  1) Status, V = Navigation receiver warning
  2) Cross Track error - nautical miles
  3) Direction to Steer, Left or Right
  4) TO Waypoint ID
  5) FROM Waypoint IDCan you comment please.
Thank you
 

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1 year 6 months ago #1489 by maitai
Replied by maitai on topic RMB sentence shows wrong waypoint name
Hi,
I remember I have been there already and I think qtVlm is right. There are on the net some documentation that are wrong.
Please check opencpn.org/wiki/dokuwiki/doku.php?id=op...tures:nmea_sentences or campar.in.tum.de/twiki/pub/Chair/NaviGpsDemon/nmea.html#RMB or . gpsd.gitlab.io/gpsd/NMEA.html#_rmb_recom...vigation_information and many other that are stating that 4 is "from" and 5 is "destination"

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1 year 6 months ago #1490 by dwarning
Replied by dwarning on topic RMB sentence shows wrong waypoint name
Interesting! I mean From -> To would be the normal human thinking. But things are different.
This is my link:
www.nmea.de/nmea0183datensaetze.html#rmb

And now openCPN 5.6.2 under Ubuntu:

<BLUE>--> 20:37:32 (TCP:10.1.1.1:10110) $ECRMB,A,0.000,R,002,001,5226.177,N,01340.350,E,3.248,134.405,-0.196,V,A*4C

You see it is vice versa the openCPN documentation. Can you check it.

Made an check with avNav too which also gave To -> From.
 
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1 year 6 months ago #1491 by maitai
Replied by maitai on topic RMB sentence shows wrong waypoint name
The documentation you are using is wrong. As I said I have been trapped already. The correct sentence is 4 = from and 5 = to

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1 year 6 months ago #1492 by dwarning
Replied by dwarning on topic RMB sentence shows wrong waypoint name
Ok, and what about my openCPN case?

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1 year 6 months ago #1493 by maitai
Replied by maitai on topic RMB sentence shows wrong waypoint name
I checked again, this time in the official (not free) NMEA documentation;
It says 4 is origin and 5 is destination.

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