Hi Chris and Richard,
"cross country over the plain to pick up main D-T piste west of Telertheba then it looked wide open and easy when I crossed A7. you can go via the salt mines (forget name), or more east past a lone cone mountain landmark just north of A2/telertheba"
Yes, that's what I mean : I've seen Telertheba and salt mines (Name is Tissemt) on IGN Map (1/1.000.000) and I think it's the more direct route between Thio and Hirafok (but I didn't know how is it).
If we have enough time, we'll try more west (as you tell it's more scenic) .
"Out in the middle of the Amadror we crossed a big piste which goes from Ilizi to Tam but which is not on any map that I have seen" : good info too, may be our guide will make us follow it...
Thanks a lot