Use 
+ 
to start track recording.
Move a little bit around
and then stop recording with 
+ 
.
After the stop recording action this track becomes the "selected track":
If you use instead of the "stop track" the "stop segment" 
,
then you can continue this track recording later with the "start segment" 
action.
So a track consists of a number of segments, which is typically just 1.
Note: As long as the GPS is switched on there is a Notification active. It disappears after switching the GPS off.
