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<div><span class="gmail_quote">On 7/5/06, <b class="gmail_sendername">Andy Armstrong</b> <<a href="mailto:andy@hexten.net">andy@hexten.net</a>> wrote:</span>
<blockquote class="gmail_quote" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">On 5 Jul 2006, at 10:24, Dan Karran wrote:<br>> - it's rather large compared to my eTrex (though it's relatively
<br>> light)<br><br>Huge, innit? :)<br><br>> - it didn't manage to get a lock on 3 satellites whilst walking to<br>> work, whereas I think my eTrex does... I should really have waited to<br>> let it get a lock before walking, but I was late already :)
<br><br>Mine took nearly half an hour to get its head together - I thought it<br>was faulty. Eventually it worked where everything was and now it gets<br>a fix within < 1 min from power up and gets a +/- 4m 3d fix shortly
<br>thereafter.</blockquote>
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<div>GPS units can't actually locate themselves anywhere on the Earth. They need to know at least which quater-sphere they are in to be able to carry out the regression necessery to determine their position. That's why the first time you use a unit (or if you turn it off, travel a significant distance and turn it on again) it takes a while to sort itself out. My Garmin GPS 60 took a good 15 mins to determine my position the first time I turned it on, and I even told it I was in London. Units with teh Sirf Star III chip shouldn't have this problem as they using GSM cells to locate themselves as well as GPS satellites.
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<blockquote class="gmail_quote" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">> - it's nice to have the mapping, base data for europe and ability to<br>> search for places<br><br>
Yup, good gazetteer - it's got places around here I've never heard<br>of. It doesn't have all the local roads though (I'm in the middle of<br>nowhere^h Cumbria in the UK).</blockquote>
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<div>So long as they don't upload to the OSM database - watch out for the classic Garmin Tawain POI that most new units have built in!</div>
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<div>nick</div>
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<blockquote class="gmail_quote" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">--<br>Andy Armstrong, <a href="http://hexten.net">hexten.net</a><br><br><br>_______________________________________________
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