First off, this is a beautiful instrument, not bright enough, but nice looking otherwise. Unfortunately, it is just eye candy and it is useless in an airplane in IFR, unless all you need to know is temperature and what time it is in UTC. There are far less expensive thermometers and time pieces out there. Sure it has other different screens you can go to Local time, a chronograph, and a flight time and interval timer screen, but after about 90 seconds, it goes back to the UTC screen and you are forced to spend valuable instrument scanning time to get back to your timer... The flight timer is the only thing you can use as a stopwatch to count up from zero to say, time a hold, or an approach, and it requires three steps to reset and restart. If you get one button push wrong, then it is about 6 more pushes to rectify. Three extra button pushes if the screen has gone back to the UTC page. Silly me for thinking that the chronograph screen was going to work as a count up stopwatch... nope, only counts down from a pre-set number. This may seem like I am being harsh on the product, but after flying with it myself, and trying to teach students with this, I have gone back to using the old fashioned digital kitchen timer for training non-precision approach, and hold timing. And those are only about $10. I was going to put these in all 4 of my planes at my Flight School to replace all my failing Davtron M803s, but I can not get the company to reply to my queries about the shortcomings of their product, so that is not going to happen. Which is a shame because it seems like it is updatable with little trouble. For what it is, dont waste your money!