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What does the Altimeter measures? - Cycling

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On non-GPS units, the Altimeter measures changes in BAROMETRIC (AIR) pressure through small vents in the back. On GPS units use either Barometric or Trigonometric measurement using 3 or more satellites. I had an older Garmin that used the Trig Satellite method. It was OK if you rode fairly straight roads without trees or rocks around. Going up steep passes with switchbacks usually gave false readings. Garmin now uses Barometric readings which are a lot more accurate, such as the 500 and 510. They also record your total ascent for a ride.

Posted on Feb 25, 2013

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The Altimeter measures elevation of your ride. It is useful if you are training for a race and you would like to keep record of your highs and lows.

Posted on Jan 14, 2013


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