Or move your queen outside your enemies sonar range. They can't chase something they can't see . This is probably the most effective block to a nav/pirate/assasin. Or smuggler, helmsman, or have a princess or have a diplomat. Actually having a diplomat is probably the BIGGEST way to counter the navirate assassin as it will just bring your queen back to life to your nearest outpost. Diplomat is a very underused but powerful specialist.
R10t--
Software Engineering student by day, avid gamer by night.