Add Ricoh doc.

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+<para>This is the format for the Ricoh 500SE GPS logging camera.
+</para>
+<para>
+ This camera creates log files on the SD card in a folder name "GPSLOG" that 
+  are named "YYMMDDN.LOG" wher NN increments from 00 through 99.  The camera 
+  appends new tracks into the current file, hence the "new track" field. When 
+  the current file reaches about 500K, NN increments and logging continues into 
+  the next file. Therefore, there may be multiple tracks in each log 
+  file, and tracks may span one or more files. 
+</para>
+<para>
+  GPSBabel will recognize the "new track" field and will generate a new track,
+  so if you specify multiple files in the correct order, your tracks will be
+  automatically split sensibly.  
+</para>
+<para>
+For additional tips, see the
+  <ulink url="http://http://wiki.openstreetmap.org/wiki/Ricoh_500SE_GPS_Log">OpenStreetMap page on Ricoh 500SE</ulink>.
+</para>
+