A little safety PSA: If you have never used a [handheld] marine flare, or you haven't used one recently, it's worth lighting one so you can develop or renew a healthy respect for them.
In addition my boat's stock of four fresh flares and four expired ones, I had four more expired flares. The only way I know to safely dispose of them is to burn them, so that's what I did (not within sight of the water). Man, those things are unbelievably bright -- and very, very dangerous. You do NOT want to hold one above skin or fiberglass! They will drip slag and make you regret it.
It was a good refresher course.
Um, don't burn one right before heading to the airport to board a flight! I stink like a fireworks factory right now.