Not sure what you mean by an "accurate route". If you are referring to trails that were recorded as tracks and put on your map but have become overgrown, the tracks that were the basis for the trails should be accurate to within 30' (standard GPSr accuracy). So if you are talking about finding a trail you want to clean up, and the map was made from tracklogs, you should be able to use the map on your GPSr to follow the trail.
If you have questions about how the data was gathered for the map or changes you'd like made you should PM the map author.