So I have a question yesterday I was doing a flight on the a320 and I was at FL360 (36,000 ft) and I did the math u told me to do 36,000 x 3 = 10800 miles + 10 = 10810 so 10810 nm is when I should start desent right? And if I’m right where will it show me how far I am from my dest on the default a320?