Fishing Pocket Sonar” - one of the more well known odd accessories

Pocket Sonar: Find Fish With a Game Boy!

My collection of unique Game Boy peripherals and cartridges. Which ones do you know? : r/Gameboy

Chicago fishing: Finding lakefront perch and waiting for the ice to arrive - Chicago Sun-Times

26 Things Only Superfans Knew The Original Game Boy Could Do

MICHAEL NEAL: Five Underrated Accessories That Belong on Every Bass Boat - Major League Fishing

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

How to determine what fish finder is most appropriate - Quora

Pocket Sonar: Find Fish With a Game Boy!

612 best Game Boy Pocket images on Pholder Gameboy, Gameboy Marketplace and Analogue Pocket

Capture the Moment – Taking Better Fish Pictures

Fly Fishing for River Pike - Flymen Fishing Company

Edge of Emulation: Pocket Sonar