Download (PDF 1.86 MB): https://research.fs.usda.gov/download/treesearch/10622.pdf
Abstract
Mandatory permits provide recreation managers with better use estimates. Because some visitors do not obtain permits, use estimates based on permit data need to be corrected. In the Boundary Waters Canoe Area, a method was devised for distinguishing noncomplying groups and finding correction factors that reflect the impact of these groups. Suggestions for improving compliance are also discussed. Overall compliance was 88% of the sample. Groups without permits were primarily daytime motorboat users. The method is applicable to other wilderness areas where permits are required.
Citation
Lime, David W.; Lorence, Grace A. 1974. Improving estimates of wilderness use from mandatory travel permits. Research Paper NC-101. St. Paul, MN: U.S. Dept. of Agriculture, Forest Service, North Central Forest Experiment Station