Now that I've had a few landings under my belt.. I can answer some questions I saw in this forum previously..
1. Yes, the radar altimeter readouts are in the .CSV file (column BP "Radar Altitude (ft)". Column BO ("Height Above Ground (ft)") is still there.. giving you AGL based upon altimeter/gps and the terrain map.
2. The
fly.garmin.com site does not give you the option to display it on the map at this time. I think it's an easy enough feature for them to add though.
3. Audio alerts down to 1 ft.
4. I've seen it display 550' occasionally, but 500' is usually where it picks up reliably.
5. Performs very good over water. To keep the legal 500' from vessels, I set the AP to an altitude that would give me 510' RA. The RA was in lockstep with any slight barometric altimeter changes (ie. from the aircraft wandering a bit before the AP would correct). The average difference between altimeter and RA was about +/- 5'. This is from analyzing the .csv post-flight.
6. If you do a go-around (or balloon up), it will give some audio callouts as you climb. For instance, if it calls out 30 and you start to climb (or balloon), it will call out 40 and maybe 50.. but at that point, it figures you aren't trying to land anymore.. so it quits bothering you. No callouts on take-off.
7. AGL is displayed whenever the RA has reliable data to display. However, I am not certain what number is displayed as the AGL number in the databar (in pink at the top of the screen, if you chose to have that displayed) -- I'll have to pay attention next time.
8. Some demo flights I took:
https://www.youtube.com/watch?v=c_1KuhIFVjQ