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Accuracy
Data type
Integrity
Classification
Flight information region boundary points . . . . . . . . . . 2 km (1 NM)
declared
1 × 10-3
routine
P, R, D areas boundary points
(outside CTA/CTZ boundaries). . . . . . . . . . . . . . . . . . .
2 km (1 NM)
declared
1 × 10-3
routine
P, R, D areas boundary points
(inside CTA/CTZ boundary) . . . . . . . . . . . . . . . . . . . . .
100 m
calculated
1 × 10-5
essential
CTA/CTZ boundary points . . . . . . . . . . . . . . . . . . . . . . 100 m
calculated
1 × 10-5
essential
En-route navaids and fixes, holding,
STAR/SID points. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
100 m
surveyed/calculated
1 × 10-5
essential
Obstacles en route . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 m
surveyed
1 × 10-3
routine
Final approach fixes/points and other
essential fixes/points comprising
instrument approach procedure . . . . . . . . . . . . . . . . . . .
3 m
surveyed/calculated
1 × 10-5
essential
Elevation/altitude/height
Accuracy
Data type
Integrity
Classification
Threshold crossing height, precision approaches . . . . . 0.5 m or 1 ft
calculated
1 × 10-8
critical
Obstacle clearance altitude/height (OCA/H). . . . . . . . . as specified in PANS-OPS
(Doc 8168)
1 × 10-5
essential
Obstacles en route, elevations . . . . . . . . . . . . . . . . . . . . 3 m (10 ft)
surveyed
1 × 10-3
routine
Distance measuring equipment (DME), elevation . . . . 30 m (100 ft)
surveyed
1 × 10-5
essential
Instrument approach procedures altitude . . . . . . . . . . . as specified in PANS-OPS
(Doc 8168)
1 × 10-5
essential
Minimum altitudes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 m or 100 ft
calculated
1 × 10-3
routine
Annex 11 — Air Traffic Services Appendix 5
1/11/01 APP 5-2
Table 3. Declination and magnetic variation
Table 4. Bearing
Table 5. Length/distance/dimension
Declination/variation
Accuracy
Data type
Integrity
Classification
VHF NAVAID station declination used for
technical line-up. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1 degree
surveyed
1 × 10-5
essential
NDB NAVAID magnetic variation. . . . . . . . . . . . . . . . 1 degree
surveyed
1 × 10-3
routine
Bearing
Accuracy
Data type
Integrity
Classification
Airway segments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1/10 degree
calculated
1 × 10-3
routine
En-route and terminal fix formations . . . . . . . . . . . . . . 1/10 degree
calculated
1 × 10-3
routine
Terminal arrival/departure route segments . . . . . . . . . . 1/10 degree
calculated
1 × 10-3
routine
Instrument approach procedure fix formations. . . . . . . 1/100 degree
calculated
1 × 10-5
essential
Length/distance/dimension
Accuracy
Data type
Integrity
Classification
Airway segments length . . . . . . . . . . . . . . . . . . . . . . . . 1/10 km or 1/10 NM
calculated
1 × 10-3
routine
En-route fix formations distance. . . . . . . . . . . . . . . . . . 1/10 km or 1/10 NM
calculated
1 × 10-3
routine
Terminal arrival/departure route segments length . . . . 1/100 km or 1/100 NM
calculated
1 × 10-5
essential
Terminal and instrument approach procedure
fix formations distance . . . . . . . . . . . . . . . . . . . . . . . . .
1/100 km or 1/100 NM
calculated
1 × 10-5
essential
ANNEX 11 ATT A-1 1/11/01
ATTACHMENT A. MATERIAL RELATING TO A METHOD
OF ESTABLISHING ATS ROUTES DEFINED BY VOR
(Paragraph 2.7.1 and Section 2.11 refer)
1. Introduction
1.1 The guidance material in this Attachment results from
comprehensive studies, carried out in Europe in 1972 and the
United States in 1978, which were in general agreement.
Note.— Details of the European studies are contained in
Circular 120 — Methodology for the Derivation of Separation
Minima Applied to the Spacing between Parallel Tracks in
ATS Route Structures.
1.2 In applying the guidance material in 3 and 4, it should
be recognized that the data on which it is based are generally
representative of navigation using VOR meeting the full
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