Swimming heart rate monitor

bethiewilliams

Does anyone know of a heart rate monitor that does not require a chest strap and is obviously waterproof. I like the idea of a wrist watch only. I just want to jump in and do my half mile ++ and see how many calories I have burnt.

When I look at the calories burnt after 40 mins I am never sure if it is fast, slow or whatever!! I have googled times etc but can't find a definitive answer!

Thanks