Depends a lot on the tide. It is always shallow and short fins are advised. But stay away from the area I cut out, between the Jetty, the boat and the sand bar. There are a few rocks just NE of the cutout area but in most tides you can sail over them. Just be careful if starting there and not yet on the plane.
Word of warning. Wind direction is important. SteveM and SteveS and I had an incredibly frustrating day there yesterday. The wind came straight over the highest part of Mosman Park causing it to vary between 3 and 23knots in 50metre wide bands. It also swung 30-45 degrees from one band to another. However it is so flat I still managed a 36.8 on the dial.
Best is highish tide and wind from S-SSW when it comes straight up Blackall Reach.