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<p>or a <a href="page.php?w=Citizen%27s_band_radio">CB</a> <a href="page.php?w=radio_shack">shack</a>.</p>

<p><big> Land surveying </big></p>
<p>In the context of external land surveying, a base station is a <a href="page.php?w=GPS">GPS</a> receiver at an accurately-known fixed location which is used to derive correction information for nearby portable GPS receivers.  This correction data allows <a href="page.php?w=radio_propagation">propagation</a> and other effects to be corrected out of the position data obtained by the mobile stations, which gives greatly</p><p>
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