What is the correct way to signal distress with a horn?

I want to paddle in the Louisiana swamps at the end of April and there is a
chance of getting lost. The critters might eat my bread-crumb trail
markers.

So, do I signal SOS on the horn? How long do I wait between blasts? How
many blasts can I get out of one horn. I'm supposing there is the "canned
air" type and maybe a rechargeable type or similar battery operated type.

Is there a different signal for paddling in the Hood Canal?

--
Sincerely,
Joanne

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