--- a/igc.h	Fri Jan 27 17:22:55 2012 +0100
+++ b/igc.h	Fri Jan 27 22:36:11 2012 +0100
@@ -3,20 +3,37 @@
 
 #include "pch.h"
 
+/*! Fix - describes one GPS fix.
+ *
+ *  A GPS fix is represented by a timestamp (no day included?),
+ *  a longitude, a latitude, the barometric altitude, the
+ *  GPS altitude and a flag, if the GPS altitude is valid.
+ */
 class Fix {
   public: 
-    enum Source { baro, gps };
+    //! Selector for the source of the altitude.
+    enum Source { 
+	baro,	//!< source from barometer
+	gps,	//!< source from gps
+    };
 
     Fix() { }
-    Fix(const QString&);
+    Fix(const QString&);    //!< parse the string for the fix
 
+    //! Get the altitude.
+    //! \param s source of the altitude (gps or baro)
+    //! \return altitude in m
     int altitude(Source s = gps) const { return alt_[s]; }
-    QTime time() const { return time_; }
-    bool is3d() const { return is3d_; }
-    QPair<QTime, int> altitudeFix(Source s) const { return qMakePair(time_, alt_[s]); }
+
+    QTime time() const { return time_; }    //!< time of the fix
+    bool is3d() const { return is3d_; }	    //!< is the gps alt valid?
 
-    QString longitude() const { return gps_.lon; }
-    QString latitude() const { return gps_.lat; };
+    //! Get an altitude fix (time+altitude)
+    //! \param s source of the altitude (default: gps)
+    QPair<QTime, int> altitudeFix(Source s = gps) const { return qMakePair(time_, alt_[s]); }
+
+    QString longitude() const { return gps_.lon; }  //!< longitude of the fix
+    QString latitude() const { return gps_.lat; };  //!< latitude of the fix
 
   private:
     QTime time_;
@@ -25,21 +42,30 @@
     int alt_[2];
 };
 
+//! List of Fixes.
 typedef QList<Fix> Fixes;
 
+/*! Representation of the IGC file.
+ *
+ *  This class represends the contents of an IGC file.
+ *  It reads from a text stream an stores the header data as well as the
+ *  fixes. The checksum verification is not implemented currently.
+ */
 class IGC {
   public:
-    void read(QTextStream&);
-    QString device() const { return device_; }
-    QString pilot() const { return pilot_; }
-    QString glider() const { return glider_; }
-    QDate date() const { return date_; }
+
+    //! Read the IGC records.
+    //!	\param s a (file) stream containing the records
+    void read(QTextStream& s);
+    QString device() const { return device_; }	//!< the generator of the IGC file
+    QString pilot() const { return pilot_; }	//!< pilots name
+    QString glider() const { return glider_; }	//!< type of glider
+    QDate date() const { return date_; }	//!< date of the record (start date?)
     
-    Fixes fixes() const { return fixes_; }
-    Fixes fixes() { return fixes_; }
+    Fixes fixes() const { return fixes_; }	//!< list of fixes
 
-    Fix start() const { return start_; }
-    Fix landing() const { return landing_; }
+    Fix start() const { return start_; }	//!< the very first fix
+    Fix landing() const { return landing_; }	//!< the very last fix
 
   private:
     QString device_, pilot_, glider_;