What does the cryptic crossword clue "How mariners know where they are, busily reading on deck (4,9)" mean?

This cryptic clue uses wordplay to arrive at the answer. Visit the page for progressive hints — definition, wordplay type, and a full step-by-step explanation.

How mariners know where they are, busily reading on deck (4,9)

Daily Mail Cryptic #16944 | 19 Across | 2022-10-12 flower

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