When are EPIRB batteries changed?

The reasoning behind selecting the option regarding when EPIRB (Emergency Position Indicating Radio Beacon) batteries should be changed hinges on the necessity of ensuring readiness and reliability of the device. The correct answer indicates that batteries should be replaced after emergency use or within the specified month and year printed on the EPIRB.

This is crucial because, after an emergency activation, it's essential to ensure the EPIRB is ready for any future emergencies. Additionally, the batteries have a shelf life that is usually indicated on the device, and replacing them according to this timeline guarantees that the EPIRB remains fully operational within its designed lifespan.

Properly maintaining EPIRB batteries, therefore, is not just about immediate response readiness but also ensuring the device functions correctly when required. The other considerations, like changing batteries after every 12 months of non-use or based on voltage levels, while practical in theory, do not align with the guidelines for ensuring that the EPIRB is used effectively as a lifesaving tool. Ensuring batteries are fresh and functional according to documented specifications is the best practice for safety and compliance with regulatory requirements.