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News / percent grade
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Jul 27, 2017
How does Garmin calculate percent grade?
Read more →On a recent mountain bike ride, a couple of us with Garmin devices began to wonder how percent grade is determined by the device. Through a local contact, I was able to go directly to the design source, Jared Bancroft, PhD – Sensors & Algorithms Team Leader. Here is what Jared told me: Grade is responsive to the slope of the trail or road. It relies on the distance as determined from GPS and the barometric altimeter sensor. Basically, it’s a ratio of the change in altitude over distance traveled. The longer the distance, the more averaged the grade is. ...