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Re: [gpsd-dev] extension for navdata

From: teyrana
Subject: Re: [gpsd-dev] extension for navdata
Date: Tue, 30 Oct 2018 17:50:46 -0400

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. 


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


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

I found an email still from July 2018
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

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


Gerry Creager
“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)

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