Yes! You can go to Williamstown or Hobsons Bay without a boat license.  However,  a license is required for 40hp and 90hp boat engines. That enables anyone to go to Westernport, Phillip Island and all inland waters such as Gippsland Lakes, Eildon, etc. You may not go more than 2 NM off Shore or cross the imaginary line between Point Cook and Modiolloc.