PLANNING FOR A TRANSIT
It must be remembered that transiting the Marion Narrows is best performed when there is no current against the waves. This can stand up the waves and make negotiating the channel difficult.
You will require about 45-0 minutes to cross Blackman Bay at 4-6 knots. Therefore arrive at the canal, or the "narrows" about 1 hour 15 minutes after high tide in Hobart. This will provide a flood tide at the narrows or the Denison Canal.
MAST track from Dec 2019 click on the following link Marion-Narrows-Navionics-Route-16-Dec-2019
OYSTER RACKS IN BLACKMAN BAY
Please note that there are many oyster farms within Blackman Bay. The approximate positions of these may be viewed by selecting the following link "Farm leases in Blackman Bay"