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<title>The xgps client</title>
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<meta name="Author" content="Eric S. Raymond">
<meta name="Revised" content="9 April 2015">
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The xgps client
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<p>Included in the package is a sample client called <code>xgps</code>. It
connects to a <code>gpsd</code> at any host you tell it to, and
requests raw data, so that it can display the current location of all
visible GPS satellites your receiver 'sees'.</p>
<p><img src="gpsd1.png" alt="[image] The GPS receiver has no fix yet."></p>
<p>The GPS receiver has not yet acquired a fix. The receiver has not
tracked the grey satellites, but knows where they should be.</p>
<p>The next image shows a good fix. A 3d fix provides latitude, longitude
as well as altitude data, and requires at least four good satellites. A
2d fix does not give altitude, but only requires 3 satellites.</p>
<p><img src="gpsd2.png" alt="[image] The GPS receiver has a good 3d fix."></p>
<p>Depending on your GPS receiver, the additional satellites may be used
to determine location with better accuracy.</p>
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