TIL the Gameboy had a sonar add-on for fishermen, that could locate fish up to 65 feet deep. It also included a fishing mini-game : r/todayilearned

A Look At The Game Boy Fishing Accessory – NintendoSoup

Original Game Boy Was Compatible with Sonar for Fishing?

A Deep Dive Look into Fishing Minigames – The Story Arc

A Deep Dive Look into Fishing Minigames – The Story Arc

Check out this Game Boy peripheral used for… fishing? – Nintendo Wire

Original Game Boy Was Compatible with Sonar for Fishing?

Fishing Game Toy for Kids Bass Beat Battery Operated Rotating Novelty Toy Fishing Game Set with 2 Fishing Rods, Sounds, Music, in Box : Toys & Games

Anyone want to go fishing? : r/Gameboy

🎣【Fishing Toy】 The fishing game has 45 fish, 4 fishing rods, and an fishing plate with music (45 fish pits).Customers need buy three AA ordinary dry

Fishing Game for Kids Fishing Toy with Music and 45 Fish 4 Rod Set Rotating Board Games Robo Fish Educational Toddler Toys Role Play Game Bath Toys

Fishing Pocket Sonar” - one of the more well known odd accessories for the Gameboy : r/Gameboy