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Garmin 4s not measuring swimming lengths accurately

Hi


My Garmin Vivo 4s is not tracking my swimming lengths properly. Usually it can be off by a couple but yesterday it failed to record 10 lengths, about a quarter of the distance I swam.

It has also been inaccurate with some runs - I did a half marathon which was confirmed by the organisers’ app. However Garmin came in at 12.7miles.

DOra anyone have any advice please?

Thanks in advance.