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  1. #1
    mtbr member
    Join Date
    Oct 2011

    Tracking Decents - 1,000,000 ft challenge

    After watching this, I got a little fired up:

    Action Cam by Sony: Adam Billinghurst - One Million Down - YouTube

    TL : DR Guy rides Whistler all day every day for 57 days to descend 1,000,000 ft

    After going back several pages and not finding any easy wins, I figured why not...

    Are you guys and galls aware of any CPS/cycling computers/etc that track DESCENTS or altitude lost?

  2. #2
    since 4/10/2009
    Reputation: Harold's Avatar
    Join Date
    Dec 2003

    Tracking Decents - 1,000,000 ft challenge

    They all do.

    Some pointers:

    - spot elevations are easy to measure with reasonable accuracy. Tracks, not so much.

    - GPS derived elevation from a consumer receiver just sucks. Depends on signal quality. Barometric altimeters are very accurate when properly calibrated. Problem is, few do. So much so that most edges cannot be manually calibrated anymore. They have a less accurate auto calibration.

    - Barometric units suffer from the atmospheric drift problem with changing weather systems so consistency over a long period can be trouble. Garmin's auto calibration tunes most of this out, but it will never be as accurate as calibrating off of benchmarks and contour lines on a topo map.

    - Then you can even post-process any GPS data to find elevation change, even if the gps itself did not collect any elevation data. This is dependent on how accurate your gps track is, but the resolution is pretty low. Typically only every 30 meters so small changes are undetected and total change is usually underestimated.

    Understanding that, most receivers with cusomizable trip computer screens should have an overall descent option. Also, you can analyze your gps track afterwards to learn your descent for that ride. Garmin Connect does that, and so does Topofusion. Others do, also.

  3. #3
    mtbr member
    Join Date
    Oct 2011
    In terms of no setup, turn on and go, barometric auto calibrating altimeter seems to be the way to go... Right?

    The end goal is something I can turn on, ride, manually enter data in a Google Form and call it good.

    Something like this?

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