Launching a research Google on "Ad Stabulum" one falls, notably on this:
 

Ancient name: Ad Stabulum
Site Type: mutatio
Site Period(s): Roman, Late Antique
Roman Province : Narbonensis I
French Department: Pyrenees-Orientales
Approximate Latitude= 41-42 degrees N. Latitude
Approximate Longitude= 0-1 degrees E. Longitude
Itinerary Information and Distances:
Antonine Itinerary: mp XLVIIII a Salsulis mp XVI ad Ad Pyrenaeum
General References: Itin.ant.390.1
Specific Ancient References: Itin.ant.390.1
Full Citations for bibliographical references.

Please send comments and corrections to:
Ralph W. Mathisen, Department of History, Univ. of S. Carolina , Columbia , SC 29208 USA 

Now, the references of our fragment on Geoportail are : 

- Latitude :    42° 34' 15"

- Longitude : 03° 00' 09" 

Not far, isn't it ? ...