I've been using the H1 for 3 months now, a couple of times a week.
Throughout all the firmware updates, I have never got this data field working properly.
I get a variety of behaviours. Most common is it appears for the first few minutes then just shows no data for the rest of the hike. Sometimes it just never shows any data, even at the start of a hike. Once, it showed no data until the last five minutes of a hike. Has always worked perfectly on 66 and 67.
I've opened a case with Garmin but they can't reproduce the issue. So, I'm interested if this data field works for other people. Good or bad, I'd like to hear what your experience is.