<span class="q"><div><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><br>What if somebody writes a free application that works but with charts that
<br>cost money ?
</blockquote><br></div></span>You can't buy the charts. They are
protected by various technical and licensing methods in each of the
products you use. The companies can't take the risk of an open source
software product revealing and de-protecting their intellectual
property. The will not license the maps in any non-secure format. Open
source is by definition insecure for these types of applications.