Boat operators must follow national and state rules about safety gear on their boats. This means having the right number and type of PFDs (Personal Flotation Devices) for everyone on board and making sure they’re easy to get to.
Readily accessible means you can get to it easily, but it might take a moment. It’s about not having big barriers in the way.
Immediately accessible means getting to it instantly, with no waiting. It’s about speed.