Originally Posted by
CargoDane
1: Just to emphasize what you're saying: So an airplane checks (basically zeroes the barometer) with the airport's barometer in order to make the barometer reading accurate, otherwise it isn't good enough. A barometer you set before you took off isn't precise enough. Bicycle computers do not have the luxury of having airports to zero their barometer readings everywhere. What you just explained doesn't actually prove what you think it proves. Or what Njkayaker thinks it proves.
More stupidity!
You don't really need to zero barometers for elevation gain.
If GPS was better than barometric measurements for airplanes, pilots wouldn't use barometers!
Originally Posted by
CargoDane
3: Garmin may default to a wheel-sensor, but most people don't actually have that installed with their bicycle computer - Garmin or otherwise - unless it is a non-GNSS unit.
The main use of wheel sensors is for accurate instantaneous speed. At cycling speeds, GPS is not very good for that. If you aren't interested in accurate instantaneous speed, you really don't need a wheel sensor.