The Balkon Great (Balcony Apparatus) was an improved version of GHG. Where the previous had 24 hydrophones, the Balkon had 48 hydrophones and improved electronics, which enabled more accurate readings to be taken.
The 3-D model is base on original German measurement and wartime photographs.
Colours are base on the original standard Kriegsmarine paints colours that include Blaugrau 58/1 (A medium to dark grey with a hint of blue), Blauschwarz 58/2 (A very dark blue), RAL 9005 (Black), RAL 9001 (Cream) and RAL 9010 (Pure white). Other colour includes from the Ostwald's color circle are Grün 22 pa and grau g.
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