Bandai displayed an interesting little peripheral for Nintendo's Game Boy at the Tokyo Game Show last weekend.
The device is called the Handy Watcher, and it acts like a fish finder. Connect the device to Game Boy and float its sensor in the sea water. It will detect sea level, terrain under the sea, and schools of fish. For real.
Handy Watcher for Game Boy is slated for a July release and will retail for 14,800 yen (about $115).