Hello Ivan!
As a kml it is all in data. However you can select the line(s) you are interested in, display it on Google Earth and save the image in such a way that the totality of the line is visible as well as some landmarks: after that you can scale it in a Photoshop layer and either extract it as a color, or copy it manually.
I had to reproduce manually all the details (the track layout precision is usually better than 1 meter...) as this data is intended for the in-game landscape, but for a navigational map you can afford to be less intricate, so the manual reproduction method above should be quite OK.
JV
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