I lived on Long Island from '99 to '05. I brought my 22' Crownline ski boat when we moved from Wisconsin/Illinois. We took one trip in the channel/intercoastal in that area and thru Great Soutn Bay by the Fire Islands. We went all the way from Islip to Jones beach area. That marking in that area is terrible. Local knowledge is a must. No consistency in where the red and green markers are placed. Sometimes in a staight line. After running aground 3 times in open water by missing the channel markers we never went there again. Fortunetly we were going slow and only wandered a few yards into the shallows and did no damage and just jumped out and pushed the boat back.
My condolences to the family and friends. Very sad.