The pirate spell sheet is an item received from Bill Teach during A Clockwork Syringe. It allows teleportation between Mos Le'Harmless and Braindeath Island, but can only be used in those two areas to travel from one to the other.
When activated, Pirate Pete appears and knocks the player unconscious, then transports them to their destination.
To use the sheet, the player must be outside and at ground level. The square due north of the player must not be obstructed (as this is where Pirate Pete appears).
On Braindeath Island, it cannot be used near Pirate Pete; he says that there is too much magic interference in the area and it could cause players' heads to explode.
Some players use the scroll after the quest as a fast banking method when killing 'Rum'-pumped crabs in the Braindeath Island 'Rum'-geon. When their inventory is full, they leave the dungeon, use the scroll to bank and restock on Mos Le'Harmless, and use the scroll again to return to Braindeath Island.