The process Larry describes works pretty well. It’s not always perfect, but it’s the closest you can get to having a good route vs just using the track.
The routing preferences on the unit need to match the setting which were used to create the route AND off-route calculation needs to be OFF. Still minor variances will occur, but it’s usually not too bad.
I usually do this and then leave the track on the map. It’s then really easy to see if you have an issue because the two lines go in different directions, then you just follow the track line. The rest of the time, the route is easier to follow. (If you’re using voice prompts thru your helmet and not looking at the screen, you’ll miss the diverging lines though…)