What is the central idea of this passage
Aficionados took such replicas on Boston Harbor, some sailors dressed like Slocum, during the 100th anniversary of his circumnavigation. One educator was inspired to “chase Joshua” by planning an expedition on Slocum’s route in a replica vessel and possibly broadcasting lessons in math, science, and history worldwide. A custom yacht designer analyzed Slocum’s nearly 37-foot yawl and was roused to design an improved Spray model. Almost