Turret 1A was probably located very near to what is now the junction of the A187 Fossway, and Coutts Road. This is based on measurement, and no evidence of the turret has been identified.[8] An alternative location would be a third of a Roman mile between the site of Horsely's Milcastle 1 (Turret 0B) and Milecastle 2 (location also doubtful).[9]
Location on Ordnance Survey 1:25 000 map: 54.981990°N 1.557071°W
Alternative location on Ordnance Survey 1:25 000 map: 54.983713°N 1.549161°W