Yep berkley is very shallow averages about 3 feet.Always head out of the right side of the harbour as your facing the lake.You will find you will have to share this ramp with the pros but its only 5 mins to the channel entrance.Ramp at Kanahooka is steep and extremely slippery and the parking is very ordinary.Not good in a stiff southerly and heaps of jetskiers frequent here.New ramp at Tallawrra is good but maybe a bit hard to find you have to go through Dapto or come back around over the Yallah overpass.Hope this helps.
cheers....Roy