>>19996016>What are the chances that you're going to take off in exactly the right direction you need to go and not lose power due to external forces like wind?>The answer is 0%...And therefore flerf = true.
Now, let's see the list of sea navigators that used dead navigation from the get-go. I mean, in theory all you need is to see how fast you've traveled for the first hour, and then calculate when you will arrive. No constant adjusting needed.
https://en.wikipedia.org/wiki/Dead_reckoning 