Waterproof HRM.

I currently have a cheap HRM that I wear when I am doing cardio - it has a chest strap and a watch, but it doesn't log anything, just shows what my HR is at that moment in time. I take a low average of what I observe as a conservative estimate of my calories burnt. It's meeting my needs at the moment but soon I'll be joining a gym that has a 14m pool. From what I've read the more advanced HRM that log swimming lengths aren't suitable on such a short pool. So as that function will be void I'm after a second best - a HRM that will record my HR over a period of time and is waterproof. (Cheaper the better ideally).

Any recommendations?

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