Welcome to the Community @DebbieTarchuk.
Your Fitbit Ionic will track your swimming activity based in the pool length data that you enter in your Dashboard. Your Fitbit device tries to identify lengths each time you swim, so you may still see an estimated number of lengths after your open water swim. You can learn more about it by checking this article: How do I track my swims with my Fitbit device?
Let me know how it goes. I'll be around if you have any additional questions.
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