The Fish Finder is an informational accessory that provides the information displayed by the Fisherman's Pocket Guide, which displays the player's current fishing power, Weather Radio, which displays the current weather, and Sextant, which displays the moon's current phase, all of which are acquired randomly by completing quests for the Angler. The information is displayed as long as it is in the player's inventory or equipped as an accessory but not as a social accessory.
- The Fish Finder resembles the Dragon Radar from Dragonball.
- Through exploitation of the save feature, you can ensure that the desired item is acquired without having to complete multiple quests. To do this, Save & Exit your game, rejoin, turn off autosave and turn in the quest. If you don't get the desired item, exit Terraria without saving (click the 'x' at the top right of the screen if in windowed mode) and rejoin. This will allow you to turn in the quest item again. Repeat this process as often as needed until you get the desired item.