The Wailing Octopus by John Blaine, "A Rick Brant Science-Adventure Story," has recently been released by Project Gutenberg.
Some of the chapter titles are irresistible: "The Fancy Frogmen," "Wreck of the 'Maiden Hand,'" "How Sings the Gay Sardine?"
At the end of the eBook is a brief description of the hero:
Rick Brant is the boy who with his pal Scotty lives on an island called Spindrift and takes part in so many thrilling adventures and baffling mysteries involving science and electronics.
Science and electronics are definitely two important ingredients for maritime adventure!