At 300 KPH who's got time to look at a Telemetry display on a radio. Maybe it should come with a plug in port for a HEAD UP DISPLAY. I use the HiTec Aurora 9 and at  65 mph on my U-Can-Do or 100 on a Mustang it is difficult to catch a glance now and then just to see the LARGE DISPLAY of the GPS speed and Altitude. If you put all the telemetry on one screen at one time it i s so small it becomes almost useless while flying. If you fly using a tray Telemetry is completely useless for in flight use. The Aurora 9 has a neat feature (TOY Play Thing) that one can record a flight on a laptop and play it back. The GPS puts out a 3D coordinate every half second so how far apart are they at 300 or so KPH. But it's still neat to see the flight after the fact. You can even play it back in GOOGLE EARTH and look at it in 3D against the back round at your field.