<para>K = Some text to display at the start of the message - <emphasis>Trkpt</emphasis></para>
<para>A = Altitude of a Trackpoint</para>
<para>S = Speed of a Trackpoint</para>
+ <para>B = Vertical Speed (Climb)</para>
<para>C = Course of a Trackpoint</para>
<para>L = Location of a Trackpoint</para>
<para>T = Time of a Trackpoint</para>