I am new to the Narragansett Bay area, and I want to get an idea of the time I’ll need to motor my Tartan 27 auxiliary from Brownell’s yard in Mattapoisett to the Cove Haven Marina in Barrington, RI. Don’t worry — I’ll be getting all necessary charts! I’m just looking for general planning information at the moment. Thanks!
Passage time
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It really is hard to estimate as it depends very strongly on the direction of the current in both Buzzards Bay and Narragansett Bay, and the wind direction, since a strong SW breeze will take off some speed through the water. Assuming you make 4 knots through the water with no wind, you might consider an over night in Newport! 
C-Map has a great free online charting program. There is a companion app with affordable chart subscriptions.
letsembark.io
C-MAP: Nautical charts
C-Map offers the most personal, stress-free, end to end marine experience by providing high-quality nautical maps along with navigation, traffic and weather information to easily plan trips on the water and enjoyable experience with peace of mind.
Sounds like a good idea! Thanks!It really is hard to estimate as it depends very strongly on the direction of the current in both Buzzards Bay and Narragansett Bay, and the wind direction, since a strong SW breeze will take off some speed through the water. Assuming you make 4 knots through the water with no wind, you might consider an over night in Newport!
The Navionics autoroute is a free and very useful tool for route planning. I just ran your course using 4 knots speed over ground and came up with 50.7 NM, 12H 40M.
webapp.navionics.com
You obviously want to verify the route in detail before setting off. For instance there is a bridge but I assume your boat has less than 65feet air draft.
Navionics ChartViewer
