While intuitively it
seems like you could run from anything with a navigator/(helmsman or admiral), that isn't actually the case. If a pirate is chasing your sub, every time you change course, the pirate's angle will change and catch up just a bit.
If you can take an outpost before the pirate catches up you'll be safe, since the pirate would then return to its owner's closest base, but if you cannot take an outpost, eventually you will be caught by the pirate.
Bangerz explains this well in one of his YouTube videos. Here's the link:
https://www.youtube.com/watch?v=nRxayLQH4eo
"No man chooses evil because it is evil; he only mistakes it for happiness, the good he seeks."
-- Mary Wollstonecraft