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Tom and I took a trip from the mooring up into Ipswich docks with the incoming tide. From our mooring, the estuary moves (upstream) in a North Westerly direction, underneath the rather spectacular Orwell bridge (A14) and then turns through North into Ipswich docks.
The main channel of the Orwell is dredged to allow ferries, container and cargo ships to access this dockland area.
On this occasion, the wind was a Force 3 North Westerly. In the dock area, the wind was flukey, and we resorted to using outboard power when coming back downstream to the East side of the bridge, where we anchored for a snack. Thereafter, we had a lovely sail tacking all the way back to our mooring.
http://www.freston.net/tower/