Moorabbin's ERSA entry has the following, so I guess they want you to climb. Suggestion above re grabbing a copy of the VFRG is a good one.
DEPARTURES
4.4. VFR ACFT departing into Class G airspace must depart the CTR on an extended leg of the circuit.
4.5. Departure altitude - climb to 2,000FT AMSL or higher, cloud permitting.