Crossword puzzle clue "communication means at sea"

Here are the possible solutions for communication means at sea clue

Answer
Clue
Relevancy
semaphore
Clue
Communication means at sea
aral
Clue
"Sea" whose name means "sea of islands"
actionline
Clue
Direct means of communication to a news outlet
airmail
Clue
Communication means since 1911
Definition
to send mail by airplane
asl
Clue
Means of communication since 1817, in brief
Communication means for the deaf: Abbr.
backchannel
Clue
Unofficial means of communication, and a hint to each set of circled letters
Covert means of communication ... or what's hiding in the circled letters?
Definition
an unofficial or covert means of conveying information, originally or esp. in political or diplomatic circles

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