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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