Re: [gpsd-dev] extension for navdata

[teyrana]

On Tue, Oct 30, 2018, 5:06 PM Gerry Creager - NOAA Affiliate <address@hidden wrote:

This is actually an extension to autopilot data for ships, rather than instrument data. 

Oh?!

Do you have a name or reference to look up for more information?   (My day job is in Maritime)

Gerry

On Tue, Oct 30, 2018 at 8:12 AM Oleg Roitburd <address@hidden> wrote:

Hi all,

I found an email still from July 2018
(http://lists.nongnu.org/archive/html/gpsd-dev/2018-07/msg00016.html)
in which it was spoken about extension for instrument data in n2k. I
think it's a good idea, but I think it's missing in nmea0183 as well.
I looked at gps.h and driver_nmea0183.c and found only DBT handling.

1) Where I think Depth doesn't belong to attitude but to navdata (
navdata.depth & navdata.depth_offset). Would that be correct from your
point of view? If yes, then DPT, DBK would also be well accommodated
there.

2) Wind: A field is still needed in navdata_t. There are True (T) and
Apparent (A) Wind. You have to distinguish them. I don't know what
data type would be better then enum? char? Your suggestion?

Then you could start to implement the corresponding NMEA sequences
Comments are always welcome

Regards
Oleg

--

Gerry Creager

NSSL/CIMMS

405.325.6371

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“Big whorls have little whorls,

That feed on their velocity; 

And little whorls have lesser whorls, 

And so on to viscosity.” 

Lewis Fry Richardson (1881-1953)