I haven’t tried it yet , but in theory the Never Lost Golf ball sounds like a good thing.

Play faster, score better and save balls says the advertising spiel. An electronic transmitter is placed inside the ball and by bluetooth signal a smartphone app (Chip-ing Finder App) allows you to find any lost balls within a minute.

The signal on the app increases until you are in the right part of the course. Then the app points you in the right direction, left or right. Searches take less than a minute and the signal can be used up to 150 yards. On average 4.5 balls are lost per round, this claims to be never lost.

More details on chip-ing.com. But is it legal?