(xD the word play has so many layers! Stop making me laugh so much!)
Nooo Meta D: didn't you tell us: no rats on boats! GhaaaWhat? No way, I am totally tired of zombies, and we rats are way too charismratic to turn in to zombies.
Vampirats could work!
...avast, mateyy, yarrr. Hoist the mainsail. Raise the anchor. Use a sextant to measure the angular distance between two visible objects.