In the interest of more realism in FSX, I'm taking Mark's advice (and a few other's, too), and starting to fly without the FSX ATC. However, I was wondering how you would know when to start your descent in a jetliner that doesn't use VNAV, for instance the 707. Of course, in the 757 or 767, VNAV would start the descent for you, but what if you don't have VNAV? Do you just decide? And in reality, would ATC tell you when to descend, or would you decide for yourself?

Also, how do you figure out the ILS intercept altitude?

Thanks,
boeing247