Re: Newport/Martha's Vineyard/Nantucket--your feedbacked needed!
So using your test date of June 20th... the turn at pollock rip is @ 12:30 in the morning.
3 hours after the turn would put you at a 3:30 am departure or so..
4 hours = 4:30 am. Sunrise on the 20th is 5 am- ish..
The 20th is a Thursday... and timing improves for a daylight departure each day after thursday..