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  1. #1
    RoadBikeReview Member
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    Sigma Rox 8.0/9.0 altimeter question....

    Do you have to enter your elevation before every ride? The manual says you have to enter it. Wouldn't it just do this on its own? I can understand entering your current elevation once, but after that I would think it just senses the changes. If I drive to PA from Ohio to go for a ride, I shouldn't have to get on the computer to look up elevations.

  2. #2
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    I don't have one of these, but I'm pretty sure you need to enter your elevation so the unit can know the current barometric pressure.

    The pressure changes day to day (and hour to hour sometimes), and since the altitude function is basically just converting barometric pressure into an altitude reading, it needs a reference point for calibration. Asking you to enter your (known) altitude at the start of the ride probably just seemed like a simpler question than asking you to enter what the unit really needs to know, which is the current sea-level barometric pressure in your area (available on weather.gov, for example).

  3. #3
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    Some brands have a button for Home Altitude. This figure can be changed, or course. But that setting will automatically compensate for weather changes and barometer numbers.

    Fortunately I live 1/8 from a local airport. The runway charts sold there indicate runway altitude. Lacking that, those brass buttons set into concrete curbs by surveyors indicate altitude.

    Not familiar with the Sigma, but look in your instructions for mention of Home Altitude.

  4. #4
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    If you press the top right and bottom right button together the Rox 9 enters into a mode that allows you to reset the altimeter. I then press the bottom right button twice to re-select my default altitude. Then you have to press the top right button to save it. Certainly not obvious, but it has become part of my pre-ride routine.

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