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A fix of an object measured from a DME has a tolerance of (1) _____, plus (2) _____ the distance to the antenna.

  • A

    (1) 1.25NM; (2) 0.25%

  • B

    (1) 0.25NM; (2) 2.5%

  • C

    (1) 0.25 NM; (2) 1.25%

  • D
    (1) 1.25NM; (2) 2.5%

ICAO Doc 8168
2.4 FIX TOLERANCE FOR OTHER TYPES OF NAVIGATION SYSTEMS

2.4.1 Surveillance radar
Radar fix tolerances are based on radar mapping accuracies, azimuth resolution, flight technical tolerance, controller technical tolerances, and the speed of aircraft in the terminal area. The fix tolerances are listed below:

a) terminal area surveillance radar (TAR) within 37 km (20 NM): fix tolerance is ±1.5 km (0.8 NM); and
b) en-route surveillance radar (RSR) within 74 km (40 NM): fix tolerance is ±3.1 km (l.7 NM).

2.4.2 Distance measuring equipment (DME)
Fix tolerance is ±0.46 km (0.25 NM) + 1.25 per cent of distance to the antenna.

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