Hey guys, I've been looking over certain things about IFR and VOR navigation that I'm studying just to grasp the concept so I can be better prepared once I finally start my flight training, but I had a question about VOR/IFR navigation.

On some approach plates, they have LOM/IAF as a waypoint before the MAP, and this is considered the FAF, but I've been trying to look everywhere on the internet on how to know when you actually pass this point besides looking at the DME equipment that lets you know how far you are from the DME/VOR. The FAF has a number as seen on: [ http://204.108.4.16/d-tpp/1108/00985V13.PDF ] which I'm guessing is the frequency that alerts you as to when you passed over it, but I don't know what instrument tool you're supposed to configure and use so that it lets you know when you have flown over it. (I'm using MS FSX, I know this is a bad tool to get experience with, but I'm just trying to get my feet wet.)

edit: Sorry, I know that the link looks kind of fishy, but it's from the fltplan website!