Originally Posted by
Jughead
Being an airline guy prior to going to UPT, I found it comical that the USAF taught/approved us "direct" to a fix, using DME, an RMI, and the bottom half of your pencil. In a T-38, doing 10NM/min.
I didn't explain that method very well. Probably about as well as my "directs" looked on a radar scope.
If you remember doing this, I guess you understood it, sort of.

Jughead,
Think what you're referring to is "fix-to-fix" navigation. Something I'm not sure anyone "fully understood" in UPT, or thereafter.
For your reminiscent pleasures though, I've included a link for remedial training.
Fix to Fix
Fly safe,
GJ