[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [gpsd-users] Trouble Receiving Time from Delorme EarthMate USB (LT-2

From: Gary E. Miller
Subject: Re: [gpsd-users] Trouble Receiving Time from Delorme EarthMate USB (LT-20)
Date: Thu, 14 Mar 2019 11:47:41 -0700

Yo Jeff!

On Thu, 14 Mar 2019 03:19:17 -0700
Jeff Morris <address@hidden> wrote:

> {"class":"VERSION","release":"3.11~dev","rev":"3.10-5.20140524gitd6b65b.el7","proto_major":3,"proto_minor":9}

Oh, my.  gpsd version 3.11?  That is ancient.  I can't count the number of
known bugs in that version that are now fixed...

> {"class":"TPV","tag":"RMC","device":"/dev/ttyUSB0","mode":2,"time":"2099-07-28T20:19:51.000Z","ept":0.005,"lat":47.751133333,"lon":-122.480016667,"epx":17.607,"epy":21.771,"track":0.0000,"speed":0.051,"eps":43.54}

Yeah, wacky time: 2099-07-28

Many people have thought how to compensate for when the GPS just lies.

Only good answer so far is to jsut ignore the bad data (the date).

> > What does "ntpshmmon" show?  
> Hmm. I don't seem to have an ntpshmmon program in my distro. I don't
> see it in any other packages in the standard repo either. Is it
> perhaps only included with NTPsec?

Yeah, only in NTPsec.

> While searching for a solution to this, before I posted to the list,
> I came across an old thread where someone was discussing the
> possibility of adding a fix for the rollover bug to gpsd. I think the
> general consensus was that since it isn't a gpsd bug, that gpsd
> shouldn't be the place to fix it, plus there are challenges in coming
> up with a workaround that could automatically and reliably determine
> what offset to use.

If we could figure out a way to have gpsd to compensate, we would try
it, but no good ideas yet.  

Ideas welcome.  If you had the current leap second, or the current almanac
(that contains the current leap second), then maybe gpsd could disambiguate
the real current year.

People rely on gpsd to set their RTC, so can't use the RTC to tell the
current year.  Chicken and egg thing...

> I understand the philosophy, but I do wish there
> was a way to just manually set the epoch date or something like that,
> for cheap old farts like me that just want to use the hardware they
> already have, and who enjoy the challenge of getting obscure, broken
> stuff to work. :-)

A common wish.  Wishes are not code...
> Thanks for your help! Again, if you have a recommendation for a $10
> unit that will work reliably, I'll probably end up going that route.

How about $4.29 for a USB u-blox 8?

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

            Veritas liberabit vos. -- Quid est veritas?
    "If you can’t measure it, you can’t improve it." - Lord Kelvin

Attachment: pgpafh7awAXSS.pgp
Description: OpenPGP digital signature

reply via email to

[Prev in Thread] Current Thread [Next in Thread]