The material below is Open Game Content from a 3PP Source
Trident of Warning
Aura moderate divination; CL 7th
Slot none; Price 10,115 gp; Weight 4 lbs.
A weapon of this type enables its wielder to determine the location, depth, kind, and number of aquatic predators within 680 feet. A trident of warning must be grasped and pointed in order for the character using it to gain such information, and it requires 1 round to scan a hemisphere with a radius of 680 feet. The weapon is otherwise a +2 trident.
Requirements Craft Magic Arms and Armor, locate creature; Cost 5,215 gp