If you use pyrotechnic visual distress signals (VDSs), you must carry at least three unexpired VDSs on board your vessel to meet carriage requirements. Pyrotechnic devices come with an expiration date, which is 42 months from the date of manufacture. You may carry expired flares as back up, but they will not count towards the legal requirement. Pyrotechnic devices should be stored in a cool, dry, and prominently marked location .

If you are using pyrotechnic VDSs, they must be dated. Expired VDSs may be carried on board, but a minimum of three unexpired VDSs must be carried in the vessel .

I hope this information helps. Here are some websites that discuss If You Use Pyrotechnic Visual Distress Signals, How Many Unexpired Vdss Must You Carry On Board Your Vessel? that you might find useful:
- [BoatUS Foundation](https://www.boatus.org/study-guide/equipment/vds/)
- [Boat Ed](https://www.boat-ed.com/tennessee/studyGuide/Pyrotechnic-VDSs/10104402_47796/)
- [Short Question](https://short-question.com/how-many-pyrotechnic-distress-signals-are-required/)
- [Sage Advices](https://sage-advices.com/how-many-pyrotechnic-distress-signals-must-be-onboard/)

Let me know if there is anything else I can help you with.

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