How to convert NMEA0183 sentence which needs different SKUpdates?

[ronzeiller]

Some NMEA0183 need more than one SKUpdate, e.g. the RMC sentence which consists of:

UTC Time
Latitude
Longitude
Speed over ground, knots
Track made good, degrees true
Date, ddmmyy
Magnetic Variation, degrees

Or HDG:
Magnetic Sensor heading in degrees
Magnetic Deviation, degrees
Magnetic Deviation direction, E = Easterly, W = Westerly
Magnetic Variation degrees

But how to get these values?

BTW: Global Time would be nice too, then logfiles could get date & time

[sarfata]

@ronzeiller you can include all of this in one SKUpdate object. One SKUpdate can contain multiple values. For example the existing parseRMC function already includes SOG, COG, Latitude and Longitude.

Does that answer your question?

[ronzeiller]

@sarfata
Sorry, I am afraid not.

We get from NMEA2000 different PGN which are in separated SKUpdate

1. PGN 129025 Position, Rapid Update Lat/Lon
2. PGN 129026 COG SOG rapid
3. PGN 127258 Magnetic Variation (for this we even do not have SignalK if I remember right...)
4. PGN 126992 UTC Time and Date (We do not have SKUpdate for this as a string is missing)

All those PGNs are needed to convert into one NMEA0183 sentence $IIRMC