Later at New Plymouth, Mayflower Master Jones unloaded four of the pieces to help fortify the colony against invaders, and would not have done so unless he was comfortable with the armament that he still had on board.
No dimensions of her hull can be stated exactly, since this was many years before such measurements were standardized.
She probably measured about 100 feet (30 m) in length from the forward end at the beak of her prow to the tip of her stern superstructure aft.
Gun deck passengers most likely used a bucket as a chamber pot, affixed to the deck or bulkhead to keep it from being jostled at sea.
The largest gun was a minion cannon which was brass, weighed about 1,200 pounds (545 kg), and could shoot a 3.5 pound (1.6 kg) cannonball almost a mile (1,600 m).
The gun deck was where the passengers resided during the voyage, in a space measuring about 50 by 25 feet (15.2 m × 7.6 m) with a five-foot (1.5 m) overhead (ceiling).
But it was also a dangerous place in conflict, as it had port and starboard gun ports from which cannon could be run out to fire on the enemy.
Aft on the main deck in the stern was the cabin for Master Christopher Jones, measuring about ten by seven feet (3 m × 2.1 m).
Forward of that was the steerage room, which housed a whipstaff (tiller extension) for sailing control; not a wheel, as in later ships.
The poop house was on this deck, which may have been for passengers' use either for sleeping or cargo.
On normal merchant ships, this space was probably a chart room or a cabin for the master's mates.
The Mayflower also had on board a saker cannon of about 800 pounds (360 kg), and two base cannons that weighed about 200 pounds (90 kg) which shot a 3 to 5 ounce ball (85–140 g).