gps tracker for swimming

Figure I should ask the OW swimmers since this will be the primary purpose for my use. Need some guidance shopping around for a simple gps tracking device I can wear while swimming in nature. Few features needed, just something that I can use to review where I swam and the distance I traveled. It must be water proof to at least 10 meters. Is there anything affordable with a decent level of sampling rate? Though not necessary, are there any products that can log a graphic representation of swimming velocity in M/s? Thank you
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