Marinas should change eyewear depth before predictable boating peaks, not rebuild the entire assortment every season.
Boating and fishing season
Increase depth behind proven sunglasses and verified lens options before sustained outdoor traffic. Keep a focused reader range for charts, labels, phones, and paperwork.
Weather
Longer daylight and favorable boating conditions can accelerate sunglass sell-through; poor weather can delay it.
Holiday weekends
Use temporary backstock buffers for known traffic spikes, then reduce them afterward.
Use last season's reorders
Preload the styles and reader powers that actually ran short rather than simply adding more units across the board.