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Calculation of completed pool lengths

I wear a Garmin Instinct. It seems to work well for calculating and reporting pool swim metrics. What I would like to know is: I enter my pool length as 50m. But how does the watch calculate the lengths I have achieved? I monitored it at first, and found that it unfailingly "knows" when I have swam 50 m, 100m, etc. What is it measuring to know what lengths I have swum?