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The black patch on the base of the vertical stab is a de-icing/anti-icing boot. From memory they are pneumatic and used along with bleed air to break up any ice formation in the area. When the C-130J was being developed the new 6 bladed props directed airflow very differently over the tail and caused excessive ice build up in the area. Iím not 100% sure if it was all C-130Jís or just the longer C-130J-30 that had the icing issues.
The square feature in the centre of the stadium (which is The Melbourne Cricket Ground, or simply MCG to any aussies) is a cricket pitch. More accurately its 5 cricket pitches, but only one is used during a game.
And finally the thing on the floating dry dock is Australiaís newest naval acquisition, a Canberra Class amphibious assault ship otherwise know as a Landing Helicopter Dock (LHD). Well it will be when completed, in this image itís was on its way into the docks for completion. Norm (Nikon Boy) who posted on the last page is a wealth of knowledge on the subject; I have little to no knowledge of anything nautical.