I'm probably being dense here but can someone explain the difference between those two please?

GE-Tours-TrackvLine.jpg

I used the Add Path tool to draw a track following a route. In the Touring settings I was trying to change the speed under the lower section, but it had no effect. Changing the upper section did. So presumably I've made a tour from 'a line'. So how is GE defining a 'track' please?

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Terry, East Grinstead, UK