Does just about any HRM have the ability to remember your highest heart rate ever, and tell you how you're doing as a percentage of that absolute max? Not just your highest heart rate on the current ride, but out of all the time you've ever used this hrm? (or settable, I suppose, if you have used another one previously)

I mean, that seems like the whole point of the exercise. But I don't know what term to look for to verify this.