Pirate Map

The Pirate Map can be dropped by any enemy in and close to the ocean during hardmode. It summons a Pirate Invasion when used, which can be used to gain the Pirate vanity set and weapons.

Farming

 * Things you will need: x2 Battle Potion(minimum), Water Candle and Diving Gear/Neptune's Shell/Gills Potion.

'''(If you are lacking Diving Gear or a Neptune's Shell please see "NOTES:" section for alternative options.)

A) So first thing's first, once you reach the shore of the beach you will drink your first Battle Potion and then proceed to hold your Water Candle for approximately 8-10 seconds before entering the water to guarantee a nice preemptive spawn is awaiting you in the depths below. Your target enemies are mainly Jellyfish and Sharks, though you will need to kill everything in order to make room for more of our two desired enemies to spawn.

B) Clear the Ocean of all enemies and swim to the surface to replenish your air(if necessary). Now quickly switch out your Water Candle. As you are surfacing/jumping out of the water you will notice your Water Candle is repeatedly being taken out and put away. Do not worry, this doesn't affect the Water Candles ability to increase the spawn rate. Do this for 8-10 seconds each time you surface to give the candle ample time to take effect. Take this brief moment to heal up or consume any other Potions you may wish use to aid you. As you submerge, 95% of the time you will be greeted by an abnormal amount of Jellyfish and Shark awaiting their much anticipated meal. And how patient they are! .. Unfortunately for them, we came here to make a meal out of them instead. Make swift work of your enemies and surface once more to repeat the method above.

NOTES:
 * If there aren't enough enemies spawning below, spend a few more seconds brandishing your Water Candle at the surface. 10-15 seconds should be your maximum wait time, as Night Time only lasts a mere 15 minutes. The less time spent fiddling about, the better.
 * While surfaced with your Water Candle out, enemies will fail to attack you until you re-enter the water passed your head.
 * Try to stay away from the edge of the world if you're using Pygmy Staff, Chlorophyte Armor(Set bonus) or likewise items as they will kill enemies outside the screen and you will not be able to reach or see any of the potential drops. Considering the map already has a considerably low chance to drop at a saddening 1%, it would really suck to have it drop out of your reach & sight.
 * To further increase the rate at which your enemies will spawn, ensure that you use this method only during Night Time or Blood Moons. During a blood moon depending on how soon you enter the Ocean Biome, a player can farm 6-10 Pirate Maps in a single night. (15 minutes)