Track Types and stuff

Can someone tell me the difference between 'Time' 'Distance' and 'Direction' track types.
Also what exactly does 'Automatic Start' mean with reference to tracks? At what point does it automatically start? As soon as you start the application?

Is there some basic documentation(I don't care how rough it is) that explains all the various configuration settings??

Regards,

Chris.

track types

time: point are saved every X seconds
distance: points are saved when you move X meters
direction: like distance, but points on line are not saved