Recreational boating and boating-related expenditures in the U.S. Great Lakes totaled an estimated $16 billion and directly supported 107,000 jobs in 2003.1 We used the locations of marinas to represent the spatial distribution of recreational boating and the number of boat slips at each marina location (aggregating adjacent marinas) as a relative measure of the use or value of each marina location.
Mapping recreational boating in the Great Lakes
Marina locations were identified from internet searchs, and the number of boat slips was obtained from marina websites when available or were counted using aerial images from Google Earth. Marinas located within river-inland lake complexes were included if within 5 km of a Great Lake. We identified 726 marinas grouped into 504 locations around the Great Lakes, with an estimated 102,251 marina slips.
We use the number of boat slips at each marina as a relative measure of of the use or value of each marina location.