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Re: [gpsd-users] STATUS_DGPS_FIX mystery

From: Gary E. Miller
Subject: Re: [gpsd-users] STATUS_DGPS_FIX mystery
Date: Fri, 22 Jan 2016 11:19:46 -0800

Yo Eric!

On Fri, 22 Jan 2016 05:24:09 -0500
"Eric S. Raymond" <address@hidden> wrote:

> > If I connect a GPS receiver that does not indicate DGPS mode, then
> > I should not be surprised if gpsd does not report that mode. OTOH,
> > if I hook up a receiver that goes to all the trouble to report DGPS
> > mode and gpsd does not report it, I think it would be correct to be
> > confused. How is it possible, with such a receiver, to determine
> > that the GPS is using DGPS?  
> You make a reasonable case, but fully exposing the information you are
> requesting would take an API break.  That can't happen soon; when I do
> those too often, distro people come and scream at me.

Eric, you raise a straw man.  All Roger wants is STATUS_DGPS_FIX back.  No
API break there.  Seems reasonable to me.

> Based on the UERE, I suggest you set an alarm threshold for spherical
> error at, hm, I'd say 21 meters or so.  If epe is more than that you
> have pretty certainly lost DGPS.

For a modern GPS I would says it should be around 5 or 6m.

Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
        address@hidden  Tel:+1 541 382 8588

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