@Mff73 I agree—the issue is more that I cannot OVERRIDE that erroneous calibration, which does make a difference (albeit small) for barometer readings, which is one of my primary uses for the watch. Its incredibly odd that manual calibration basically refuses to “stick” when applied, regardless of the magnitude of the offset. Given this issue persists days later, that magnitude can drift much much higher (on the order of 150 feet or more I’ve seen) with the normal accumulated error from altimeter only use (driving, moving around, etc).