Nice to see folks talking about setting off old flares for the experience!
I've taught wilderness survival for years and really pushed the point of people practicing with their emergency gear!
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Signal mirrors are another!
When I teach a class, I always bring an assortment of shiny object to include signal mirrors (not just the plastic ones sold in stores... but the large glass ones that are Coast Guard approved, as well).
I take them out to a very large field and have half the group head towards the sun, then have the other half attempt to 'flash' their partners.
They get to figure out if all those instructions from survival books actually work... and how to make them work if they do.
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While I'm just getting into sailing, I am already thinking I'd like to have both incendiary flares and an electronic light/flare.
My only dilemma is that practicing with the hand helds and the smoke flares was easy. The aireal flares not so much. I would have liked to fire some off but couldn't find a way to do that without creating a potential emergency response. I contacted the power squadron, the sheriffs department, the coast guard auxiliary and no one was able to offer me a "legal" way to shoot them off or dispose of them. Any suggestions?
On the question of approval, I did a lot of research and the information I found says the Weems product is Coast Guard approved.