I just read through this entire thread because I was wondering why I couldn't zero my Alt. at the field in NTTR just like the original poster. I even watched the old video on altimeter settings. Great stuff! I feel smarter already but, I think we haven't answered the problem which is how do you get height above the airfield on your altimeter in the NTTR map. Do you just have to set QNH according to the altitude of the airfield according to the editor and do the math in your head? Do you just rely on radar alt? If I'm missing something basic here, please let me know. I'm always willing to learn and understand. I think where this got confusing for me is flying Russian aircraft like the Mig21 or 15 where your alt. is displayed in meters and you have the altitude of the airfield in feet. Of course I know you can convert the alt of the field into meters but, it still seems overly complicated to get a zero level at runway indication. Thanks for all the input. Wait, I just thought of something else. Let's say you want to setup for pattern altitude approaching an airfield in the Mig21. How would you determine what the patern alt. should be and how do you make sure you compute that correctly in the aircraft?