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Table 1 ICAO GNSS requirements for different phases of flight

From: Advances in BeiDou Navigation Satellite System (BDS) and satellite navigation augmentation technologies

Typical operationAccuracy (H,V)IntegrityContinuityAvailability
Integrity probabilityAlert limit (H,V)
En route3700 m, –1–1 × 10−7/h3700 m, –1–10−4 to 1–10−8/h0.99–0.99999
Terminal740 m, –1–1 × 10−7/h1850 m, –1–10−4 to 1–10−8/h0.99–0.99999
NPA220 m, –1–1 × 10−7/h556 m, –1–10−4 to 1–10−8/h0.99–0.99999
APV-I16 m, 20 m1–2 × 10−7/APCH40 m, 50 m1–8 × 10−6/15 s0.99–0.99999
LPV16 m, 20 m1–2 × 10−7/APCH40 m, 50 m1–8 × 10−6/15 s0.99–0.99999
LPV20016 m, 4 m1–2 × 10−7/APCH40 m, 35 m1–8 × 10−6/15 s0.99–0.99999
APV-II16 m, 8 m1–2 × 10−7/APCH40 m, 20 m1–8 × 10−6/15 s0.99–0.99999
CAT-I16 m, 4–6 m1–2 × 10−7/APCH40 m, 10–15 m1–8 × 10−6/15 s0.99–0.99999
CAT-II/IIIA6.9 m, 2.0 m1–2 × 10−9/APCH17.3 m, 5.3 m1–4 × 10−6/15 s0.99–0.99999
CAT-IIIB6.1 m, 2.0 m1–2 × 10−9/APCH15.5 m, 5.2 m1–1 × 10−7/15 s0.99–0.99999
  1. APCH APproaCH, H Horizontal, V Vertical