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I took my son to Middle Head in Sydney Harbour on Saturday to see all the old gun emplacements dating from the 1790's through to the end of WW2 On the old original emplacements (carved out of solid sandstone by convicts) was a bewildering sign. As indicated in the pic, there was the number 10.6 with an upward pointing arrow below the number carved into the side of the emplacement on three and 10.7 with an arrow on the fourth while another over the other side had 10.8 with an arrow. Can anyone explain what it means?