I have found a very simple Mod that installs several additional beacons in the NTTR area. Especially useful are the additional NDBs which now allow reasonable navigation for non Tacan equipped aircraft such as the L-39C, the Sabre and probably the Mig15.

I have attached the zip file below, just extract the folder structure and put it into your JSGME Mods folder.

Better still, having looked at the .lua file structure it should be possible to add our own NDBs to permit NDB instrument approaches to Nellis, Groom Lake and Creech. This should make the teaching of procedural IF in the L-39C feasible.