Re: [Thumbgps-devel] supercap vs. battery in Macx-1 GPS receiver

[tz <thomas@mich.com>]

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Also the Ephemeris doesn't help if you move more than about 500 miles from
the last place it was turned on.   Until it can get at least a 2d fix and
new latitude/longitude, it won't know which satellites to look for.

The same thing happens with AGPS (the ephemeris usually lasts for a week
but not more).  You need to know the UTC time and the lat/lon within 500
miles.  On my old Nokia n810 you could tap your location.

On Thu, May 10, 2012 at 2:03 PM, Eric S. Raymond <esr@thyrsus.com> wrote:

> Gary E. Miller <gem@rellim.com>:
> > Yo Jau-Yang!
> >
> > On Thu, 10 May 2012 18:38:41 +0800
> > "Jau-Yang Chen" <cjy@navisys.com.tw> wrote:
> >
> > > After being fully charge, the supercap in Macx-1 could last around 4
> > > hours, and around one week for Li-ion battery,
> >
> > Well, that explains my one hour cold start when receiving the sample
> > units.  One week hold-up is pretty short, and 4 hours hardly worth the
> > effort.
> >
> > Luckily the thumbgps project is for always on, but for weekend use
> neither
> > is good.  Most mouse GPS have batteries are good for a month or more of
> > standby.
>
> Opps, wires are crossed here - I believe cjy was speaking
> subjunctively and the device as shipped has a Li-ion battery in it,
> but the supercap is a manufacturing option. He'll correct me if I'm
> wrong.
> --
>                <a href="http://www.catb.org/~esr/">Eric S. Raymond</a>
>
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