There are several considerations to take into account when deciding where to store a PFD on a boat. One is whether the PFD will be needed for quick and easy access in an emergency situation. If so, it's best to keep it in a location that is easily accessible, such as on deck or in a storage locker near the cockpit. Another consideration is the type of PFD; some are designed to be stowed away, while others are meant to be worn at all times. The latter type is usually more comfortable and easier to move around in, making them a good choice for active boaters who don't want to have to stop and put on a PFD in an emergency. Finally, consider the climate and conditions you'll be boating in; if you're planning on spending time in cold water, you'll want a PFD that is designed for warmth as well as flotation.