Originally Posted by
njkayaker
The correction feature is disabled by default for devices that use a barometer. It's enabled for devices that only use GPS.
Garmin rates barometric data as better than GPS for elevation.
The manual calibration is useful for determining altitude (which few cyclists care about). It should not matter for elevation gain.
Thanks, that explains why the correction is disabled. The barometric data seems very good on my Edge 530 and certainly not seeing the issue the OP is with his phone.