Originally Posted by
CargoDane
You first tried to dismiss other sat systems and whatnot because they weren't in cycle computers, but now you post a link to a frigging watch? Yes, a barometer in a watch is a cheap way of getting altitude data - especially as it probably haven't the space to use that many different GNSS systems.
Yes, that watch (in 2017) uses GPS (not Galileo, Glonass, or anything else), so it can be hard for it to receive enough sat signals to get a precise altitude. If you have a watch/cyclecomputer/whatever that uses more than one system, it will have that many more sats to connect to, improving measurements immensely. 2017 is ages ago in the smartwatch "scene".
D-GPS and WAAS aren't "sat systems".
Talking about units that have to be stationary and use ground-based systems to get accurate data in a discussion about bicycle GPS units make no sense at all.
The Garmin watches don't seem to perform any different than the cycling units.
It seems to be difficult to get more-recent info. But I provided something and you provided nothing.
And, even for the latest units, Garmin rates barometric data over GPS data.