Single element pure CSS
International Maritime Signal flags
A [Alfa]
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"I have a diver down; keep well clear at slow speed."
D [Delta]
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"Keep clear of me; I am maneuvering with difficulty."
J [Juliet]
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"I am on fire and have dangerous cargo on board: keep well clear of me."
M [Mike]
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"My vessel is stopped and making no way through the water."
Q [Quebec]
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"My vessel is 'healthy' and I request free pratique."
X [Xray]
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"Stop carrying out your intentions and watch for my signals."