By the way, there's no reason this spreadsheet can't be used with a flight sim like MSFSX or whatever as well. The route planner includes a database of about 15,500 cities worldwide (many nowhere near water) and will plot the shortest route between any two.
The sight reduction calculator should work with aerial observations, as well.
There are a couple of minor bugs I have left to kill. (See the bottom of the instructions tab.) And some more features I want to add.
I was thinking of making a special
edition, too.