Shorecasting

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My nephew has been into fishing for the past year+ (he's 14) and has recently gotten an ulua pole, however we are worried about him getting swept out, while we are confident in his ability to tread water, im wondering if so.ething like a Garmin instinct 3 (watch with gps) would be helpful for him to have should the worst happen and he gets swept out so Search and Rescue might have a better chance of finding him. Is this a good idea, are there other watches or better ideas for this scenario?

EDIT:

Thank you all for the great info! Im not really into fishing and the like but he is and im trying to be a great funcle, while being safe! I had no idea PLD were a thing.

Thanks again!!!