In reply to Lakesben:
To some extent, given that the natural environment changes, maps and guidebooks are bound to suffer changes being only as good as the day they are printed. That's why I always prefer guidebook publishers who volunteer updates to their guides on their website. Sunflower Books are one such outfit that offer updates on their webite that come to mind and I'm sure there are other publishers who do it.
However, people might draw a distinction with errors at print time that might e.g. cause fatalities.