Choum-Atar
 

What's the condition of the piste please?

Simple, straightforward.
 

Simple, straightforward, no need to worry.
If you can reach Choum you will be able to find Atar.

Heading out of Choum south, lots of track merge into a piste, follow the piste, after a while it climbs on to a plateau with a good gravelpiste, after the plateau you will probably find a checkpoint at a auberge (sometimes Gendarme, sometimes Military or Douane, sometimes nobody), after the checkpoint following the road you will see lots of tracks wandering off to your right, they all take a shortcut to Azougi and Atar. Following the main piste you will reach a major crossing, going right you wil reach Atar (going through Azougi), going straight on you are following the bushtaxi route to Atar.

Thanks for the comprehensive reply.:thumbup1:

The only concern is how soft/sandy the 'tracks' which lead on and off the gravel piste are...