NMEA Sentence HDG

[Andreas29]

Hi,

how does OC exactly work with the nmea sentence HDG?
Does OC use the values for devitation and variation or does OC just use the value for the heading and calculate then with the WMM plugin?

Thanks and regards

Andreas

[transmitterdan]

Originally Posted by Andreas29

Hi,

how does OC exactly work with the nmea sentence HDG?
Does OC use the values for devitation and variation or does OC just use the value for the heading and calculate then with the WMM plugin?

Thanks and regards

Andreas

If HDG message also contains the variation and E/W flags then O will use that. If not then it will look in RMC message for a variation. If nothing there it will use WMM plugin unless user has selected the variation manually in options.

[bdbcat]

TDan...

Nicely stated.

Thanks
Dave

[Andreas29]

Hi,

@transmitterdan: Thanks.

Regards

Andreas

[rgleason]

Added to FAQ, did not know where else to put it.

https://opencpn.org/wiki/dokuwiki/do..._sentence_work

also added here
https://opencpn.org/wiki/dokuwiki/do...nmea_sentences

Originally Posted by transmitterdan

If HDG message also contains the variation and E/W flags then O will use that. If not then it will look in RMC message for a variation. If nothing there it will use WMM plugin unless user has selected the variation manually in options.