+<section><title>What to Do if &appname; Does Not Seem to Work</title>
+<para>
+In order to get some information about what &appname; is doing, start it in verbose debug mode via the command line:
+<programlisting>viking -dV</programlisting>
+</para>
+<para>
+For instance you can check the correct URLs &appname; is using in requesting remote data for DEMs or map tiles in the verbose debug output.
+E.g. Something like this for DEMs:
+<screen>
+** (viking:28778): DEBUG: curl_download_uri: uri=http://dds.cr.usgs.gov/srtm/version2_1/SRTM3/Eurasia/N48E008.hgt.zip
+* About to connect() to dds.cr.usgs.gov port 80 (#0)
+* Trying 152.61.128.95... * connected
+* Connected to dds.cr.usgs.gov (152.61.128.95) port 80 (#0)
+ GET /srtm/version2_1/SRTM3/Eurasia/N48E008.hgt.zip HTTP/1.1
+User-Agent: viking/0.9.8 libcurl/7.18.2 GnuTLS/2.4.2 zlib/1.2.3.3 libidn/1.8
+Host: dds.cr.usgs.gov
+Accept: */*
+ HTTP/1.1 200 OK
+ Date: Sun, 26 Jul 2009 18:13:38 GMT
+ Server: Apache
+ Last-Modified: Tue, 21 Jul 2009 19:57:35 GMT
+ ETag: eac3f8-1828f5-46f3caa76070a
+ Accept-Ranges: bytes
+ Content-Length: 1583349
+ Content-Type: application/zip
+
+* Connection #0 to host dds.cr.usgs.gov left intact
+* Closing connection #0
+** (viking:28778): DEBUG: dem_layer_add_file: /home/username/.viking-maps/srtm3-Eurasia/N48E008.hgt.zip
+</screen>
+Or for OSM Mapnik tile server:
+<screen>
+* About to connect() to tile.openstreetmap.org port 80 (#0)
+* Trying 193.63.75.28... * connected
+* Connected to tile.openstreetmap.org (193.63.75.28) port 80 (#0)
+ GET /13/4065/2748.png HTTP/1.1
+User-Agent: viking/0.9.96 libcurl/7.20.1 GnuTLS/2.8.6 zlib/1.2.3.4 libidn/1.18
+Host: tile.openstreetmap.org
+Accept: */*
+
+* HTTP 1.0, assume close after body
+ HTTP/1.0 200 OK
+ Date: Thu, 14 Oct 2010 22:18:42 GMT
+ Server: Apache/2.2.8 (Ubuntu)
+ ETag: "b66ff9d46474bab68262a3483428a232"
+** (viking:16704): DEBUG: curl_get_etag_func: ETAG found: "b66ff9d46474bab68262a3483428a232"
+ Content-Length: 17194
+ Cache-Control: max-age=94805
+ Expires: Sat, 16 Oct 2010 00:38:47 GMT
+ Content-Type: image/png
+ Age: 5153
+ X-Cache: HIT from konqi.openstreetmap.org
+ X-Cache-Lookup: HIT from konqi.openstreetmap.org:3128
+ Via: 1.1 konqi.openstreetmap.org:3128 (squid/2.7.STABLE7)
+ Connection: close
+
+* Closing connection #0
+* About to connect() to a.andy.sandbox.cloudmade.com port 80 (#0)
+* Trying 178.63.75.195... ** (viking:16704): DEBUG: curl_download_uri: uri=http://tile.openstreetmap.org/13/4065/2749.png
+* About to connect() to tile.openstreetmap.org port 80 (#0)
+* Trying 193.63.75.28... * connected
+* Connected to a.andy.sandbox.cloudmade.com (178.63.75.195) port 80 (#0)
+ GET /tiles/cycle/13/4065/2747.png HTTP/1.1
+User-Agent: viking/0.9.96 libcurl/7.20.1 GnuTLS/2.8.6 zlib/1.2.3.4 libidn/1.18
+Host: a.andy.sandbox.cloudmade.com
+Accept: */*
+
+* connected
+* Connected to tile.openstreetmap.org (193.63.75.28) port 80 (#0)
+ GET /13/4065/2749.png HTTP/1.1
+User-Agent: viking/0.9.96 libcurl/7.20.1 GnuTLS/2.8.6 zlib/1.2.3.4 libidn/1.18
+Host: tile.openstreetmap.org
+Accept: */*
+
+* HTTP 1.0, assume close after body
+ HTTP/1.0 200 OK
+ Date: Thu, 14 Oct 2010 23:44:35 GMT
+ Server: Apache/2.2.8 (Ubuntu)
+ ETag: "8e520ad47ce9c1b63430554886eb5fab"
+** (viking:16704): DEBUG: curl_get_etag_func: ETAG found: "8e520ad47ce9c1b63430554886eb5fab"
+ Content-Length: 18094
+ Cache-Control: max-age=87742
+ Expires: Sat, 16 Oct 2010 00:06:57 GMT
+ Content-Type: image/png
+ X-Cache: MISS from konqi.openstreetmap.org
+ X-Cache-Lookup: MISS from konqi.openstreetmap.org:3128
+ Via: 1.1 konqi.openstreetmap.org:3128 (squid/2.7.STABLE7)
+ Connection: close
+</screen>
+</para>
+</section>
+
+</section>
+<!-- End of Howtos -->
+