Michael 182 wrote:

You enter the one behind you and activate the leg you are intercepting.

This is about intercepting an airway at some point that's not a fix, right?
In that case, you could "build" the airway segment with the fixes before
and after your intercept point or you could get "after" fix into the GPS
and then use OBS mode.

I have to admit, though, when given an airway intercept I find it easier to
use a VOR receiver. The "user interface" seems to involve less work to me
(although the end result of the GPS process yields more benefit).

- Andrew