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Inaccurate data on Garmin Forerunner 910XT while swimming continuous legths

Former Member
Former Member
I have been consistently unable to record accurate data on my Forerunner 910 XT when swimming.
This difficulty is especially quite acute while swimming long distances in the pool.
As a result,I am getting unrealistic data,which is defeating the entire purpose of having the device.
Can anyone here let me know what is it that Ii am omitting to do/doing wrong?
Thanks.