Originally Posted By: Ian
The Gibson kite was used in life rafts with great success.

Gibson Kite


There is this nautical distress kite that has managed to stay on the market for a while.

Seems handiest to increase your visual footprint to other boats, but is also rated to hoist a USCG compliant strobe for doing same at night.

I have a post on that here.
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A signal mirror should backup a radio distress signal, like a 406 MHz PLB (ACR PLB) (Ocean Signal PLB)