As others have said the Pitt water departure was the only 30 departure in AN/TN days due to Engineout limitations with a straight ahead engine failure.Hobart wasn't the only port with a 'curved' departure and all were based on a turn from a visual sighting point ( SE shore of Barilla Bay rings a bell ) then a 15' bank turn on to the escape heading.( I also remember that 3 lights had to be visible for a night departure.Two on Mt.Lord and a third on the point NW of the runway.Don't think that one is there now.Eventually each Airline came up with a straight flight path engine fail procedure and the Pitt water dep. went out of favour for jet ops.Have noticed that QF still use it though in VMC conditions.