THanks Torp and Sailor for your prompt replies ,the reference books on Large circle trigonometry I no longer have ,no reference was made as to being on land so it is to be taken that we assume we are on board . Torp has mentioned that 10nm can only be seen under any circumstances and the fact that the game is on a flat plain answers the question, I never got to use these calculations in the real world but they were the easiest to remember . H
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