That guidebook was very helpful for us. The authors even signed it. The map from the outfitter noted a few campsites that were not in the guidebook. The one on Cumina Island for example was very helpful for our planning. The guidebook had some which were not on the outfitters map as well. We were on the constant look out for "potential" campsites if the conditions changed quickly. I hope you get a chance to get around Simpson, it was spectacular.