Originally Posted by
njkayaker
The bicycle computers don't use D-GPS. And they may not use WAAS.
One way of getting higher accuracy is by keeping the receiver stationary.
Garmin (kind of an expert in this) still rates barometric readings as better than GPS.
Again: GPS is the older US military sat system.
Garmin is known to use old tech. But even they have sat (GNSS) computers which use Glonass, Beidou, and, I believe, Galileo, in addition to the old American GPS.
Cyclists are not typically interested in absolute elevation.
They are more interested in elevation gain. Drift over days doesn't really matter.[/quote]
So which is it? If you have absolute elevation, you can easily calculate elevation gain.
I wasn't talking about drift over days. Even during a day where you actually go somewhere, the barometric pressure can change quite a lot. Hell, even the topographical features can change the barometric pressure if wind is present. It is not really as good as you think it is. It is a cheap way to get altitude, but not very precise.
But you do you, relying on data that is decades old.