Navigating to a course, but not the beginning.

How can I navigate to a course, when I do not want to go to the beginning/ start of the course. It seems pushing the 'X' when the device asks me if I want to navigate to the beginning should do this, but nothing happens when I do push the 'X'. I expect a pink route line, just as when I ushthe 'V' for navigating to the start.

Does any-one have a suggestion?