RES749 – 398 – 2 Other cases ARNS station System type code Coordination distances for MS receiving base stations (km) Coordination distances for MS transmitting base stations (km) RSBN AA8 50 125/175* RLS 2 (Type 1) (aircraft receiver) BD 410 432 RLS 2 (Type 1) (ground receiver) BA 50 250/275* RLS 2 (Type 2) (aircraft receiver) BC 150 432 RLS 2 (Type 2) (ground receiver) AA2 50/75* 300/325* RLS 1 (Types 1 and 2) (ground receiver) AB 125/175* 400/450* Other types of ARNS terrestrial station Not applicable 125/175* 400/450* Other types of ARNS airborne station Not applicable 410 432 * 50% ≤ land path ≤ 100% / 0% ≤ land path < 50%.