Sounds like Long Island government.Our slip is in a county park - it very nice and we love it. Renewal notices are sent out in December - Payment in Full for year required by end of January or you no longer have a slip. Renew and leave during the year (or downsize) - no refunds - Upgrade during the year if your boat fits in the slip size allowed you pay the difference - if it does not see previous statement. New slip holders that come in mid-year should someone leave will also pay for full year - even if they come in during October for one month. If you sell your boat new the owner also has to vacate slip. County loves to double dip.
-Kevin