That's your garmin training centre. If you create a garmin connect account: http://connect.garmin.com/
And then you can sync your training centre to that and they must have a formula to correct your height data.. its much more accurate from connect..
You can also just down load sport tracks software on to your computer: http://www.zonefivesoftware.com/sporttracks/
That's much more accurate for height gain, its a free version and easy to use.







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