Waterways.

Information on waterways came from a variety of sources. The path of the Intercoastal Waterway (ICW), feeders, and some local canals were interpreted from signage information by Antonini and Box (1996). The location of some unmarked waterways were evident from bathymetric information (areas where a channel exists where no other obvious ways for boat passage). In local channels, many of the centerline depth measurements used for the bathymetric maps were coincident with an obvious channel; in such cases those measurements were used.