re: I give up - getting a yak

quote:

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You also need a whistle or airhorn.

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Nope. Although I highly recommend it:

CLASSIFICATION OF VESSELS
Class A----Less than 16 feet
Class 1----16 feet to less than 26 feet
Class 2----26 feet to less than 40 feet
Class 3----40 feet to less than 65 feet

SOUND SIGNALING DEVICES:
Every motorboat or vessel of Class 1, 2, or 3, shall be provided with an efficient whistle or other sound-producing mechanical appliance. Every motorboat or vessel of Class 2 or 3 shall be provided with an efficient bell.

You can read all the regs on boating here:
LINK