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Probably a gun or a sword
Astrolabe, maps, and a Portuguese pilot.
cannons, maps, spyglasses, ships, weapons - guns and crossbows
nowadays they use ship
They didn't use boats.
they had guns, armor, and better immune systems.
he did most of it by land but i think he used it at one time
A boat
It depends what you are going to use it for and what your preferences are.
There are different types of fire extinguishers. For a boat it would be best to get a portable type like those designed for use in automobiles.
The type of boat that the Eskimos aka Inuit use is called a kayak