Originally Posted by
sierrabob
Well, maybe you won't drool too much. But keep in mind the Sigma ROX 9.0 has barometric altimetry, not GPS elevation. It reads slope continuously with better accuracy and fewer errors than a GPS based system. You may not agree, but GPS computes position far better than elevation. In the aviation business, we seldom use GPS altitude, but always use baro.
Also, a droid phone with voice nav capability (using OsmAnd) is very addicting. You plot a route, plug in the headphones, turn on the music then mindlessly ride without thinking about how far you're riding.
If I become totally obsessive, I can compare GPS elevation gain with the GPX route I record with the phone to the Sigma barometric elevation gain after a long ride.
Although you can't run with the ROX 9.0, you can use a smart phone for running now with the available arm strap.
But how much data do we really need?
I trust the post-ride GPS mapped software elevation correction more than a small computer's barometric altitude. The hardware altitude correction on the Garmin 305 is admittedly horrible, but once you download the data, you can just click 'correct elevation' in most programs (or not even click at all - often automatic) and it correlates with elevation maps. It's been extremely reproducible.