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Please get in touch with our product support team in the following link so they can get more information and assist you: www.garmin.com/support ~JH
Sorry, there was a problem. Please try again later.The Forerunner and all GPS watches rely on multiple GPS signals to calculate the information you seek. They all have built-in programming to "smooth" these reading out otherwise the information would be so chaotic as to be useless, so between problems inherent in GPS technology and how the data is parsed, there will be errors. Experiences and perceived exertion will still be factors in any training
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