Might mean (unverified): Study and technology of underwater navigation.
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We found 2 dictionaries that define the word hydronautics:

General (2 matching dictionaries)
  1. hydronautics: Merriam-Webster
  2. hydronautics: Wiktionary

Definitions from Wiktionary (hydronautics)

noun:  (nautical) The science of the design and construction of ships, their engines, and their instrumentation

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