Should I take a scuba refresher?
Some dive shops will suggest a refresher if you haven’t been diving in six months, especially if you have less than 20-lifetime dives. If you have an extensive diving history (verified by a log book), then you may not need to consider a refresher unless it’s been a year or more since your last dives.
Does PADI require a refresher?
Your PADI certification never expires; but if you haven’t been diving in a while, it’s better to be over-prepared than risk a problem because you forget something important. Dive shops also appreciate seeing a recent ReActivated date on your certification card.