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.<br>
<br>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.<br><br><div class="gmail_quote">
On Thu, May 10, 2012 at 2:03 PM, Eric S. Raymond <span dir="ltr"><<a href="mailto:esr@thyrsus.com" target="_blank">esr@thyrsus.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Gary E. Miller <<a href="mailto:gem@rellim.com">gem@rellim.com</a>>:<br>
> Yo Jau-Yang!<br>
<div class="im">><br>
> On Thu, 10 May 2012 18:38:41 +0800<br>
> "Jau-Yang Chen" <<a href="mailto:cjy@navisys.com.tw">cjy@navisys.com.tw</a>> wrote:<br>
><br>
> > After being fully charge, the supercap in Macx-1 could last around 4<br>
> > hours, and around one week for Li-ion battery,<br>
><br>
</div>> Well, that explains my one hour cold start when receiving the sample<br>
> units. One week hold-up is pretty short, and 4 hours hardly worth the<br>
> effort.<br>
><br>
> Luckily the thumbgps project is for always on, but for weekend use neither<br>
> is good. Most mouse GPS have batteries are good for a month or more of<br>
> standby.<br>
<br>
Opps, wires are crossed here - I believe cjy was speaking<br>
subjunctively and the device as shipped has a Li-ion battery in it,<br>
but the supercap is a manufacturing option. He'll correct me if I'm<br>
wrong.<br>
<span class="HOEnZb"><font color="#888888">--<br>
<a href="<a href="http://www.catb.org/%7Eesr/" target="_blank">http://www.catb.org/~esr/</a>">Eric S. Raymond</a><br>
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<br></blockquote></div><br>