When doing a very steep max effort climb yesterday, all of the sudden my Garmin started beeping, but my screen was on the map, and there were no brain cells left to mess around on the thing, since I was completely maxed out and trying not to fall over.
Is this a warning from the Xert data field that some kind of limit is reached wrt my performance? I can assure you that if it was, it was pretty accurate 
It starts beeping 20 or 30 seconds before you are going to hit a breakthrough. It’s an encouragement to keep going to hit a breakthrough.
You also get a single beep when you hit the target for one of the 3 buckets.
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