Oceanic Checklist — NAT-HLA

Flight planning → coast in · en-route alternates · works offline

v16 · 21/10/2026

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Crossing

Oceanic clearance / RCL windows from the OEP

En-route alternates — NAT reference

Status at

UTC now--:--
Azores--:--
Greenland (Nuuk)--:--
Gander--:--

Distance from a position

Schematic lat/long grid (not a chart). Tap a pin to jump to its card. Distances are great-circle NM from the position above; times and rings are still air at the diversion TAS (no wind). “Alternates” draws the rings of the airports shown by the filter below.

Badge = availability at the time chosen above, as interpreted from the published hours. It is not a weather or NOTAM check.

Planning notes

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    Sources

    South Atlantic corridor — EUR/SAM reference

    Airspace: RVSM / RNP10 between FL290–FL410 · HF radio required (VHF alone is not enough); CPDLC/ADS-C a bonus, not compulsory · DCT routing ok above FL245.

    SLOP here differs from the NAT: centre, 1 NM or 2 NM right.

    Comms by FIR:

    • SBAO Atlantico — CPDLC primary and works well; HF secondary.
    • GOOO Dakar — hard to raise on HF or CPDLC; request step climbs / deviations with SBAO or GVSC instead.
    • GVSC Sal — HF/VHF primary; CPDLC primary only on UN741.
    • SBRE Recife — may accept CPDLC but prefers VHF.

    Overflight permits: required for GOOO, SBAO and SBRE (not for GCCC/GVAC). Permit numbers in item 18 RMK/ of the FPL; include FIR crossing points in the route if possible.

    Alternates — read the fine print:

    • SBFN Fernando de Noronha — not international, not H24: do not plan as alternate.
    • FHAW Ascension — emergency diverts only (no infrastructure for planned diverts).
    • FHSH St Helena — Tue–Thu 08–16, Fri 12–16, Sat 04–17; 48 h prior notice by e-mail to use as alternate.

    ACC phones: GCCC +34 928 577 064 · GVAC +238 241 17 30 · GOOO +221 33 869 23 35 · SBAO/SBRE +55 81 3462 2742

    NAT OPS Bulletins in force 7 PDFs · 18 SEP 2026

    Per the official NAT OPS Bulletin Checklist issued 18 September 2026. Tap to open — the PDFs ship with the app and work offline.

    Checklist Current bulletin list — issued 18 SEP 2026
    2017-004 R2 NAT Data Link Special Emphasis Items
    2019-003 R5 Data Link Performance Improvement Options
    2023-001 R6 NAT Oceanic Clearance Removal (25 FEB 2026)
    2024-001 PBCS Tracks
    2025-001 NAT GNSS Interference Procedures
    2026-001 OESB — Oceanic Errors Safety Bulletin (18 SEP 2026)

    Official source for currency: ICAO EUR/NAT — NAT OPS Bulletins — check the bulletin checklist when a new one is announced and replace the files here.

    Weather avoidance

    Any deviation requires an ATC clearance — request FIRST: CPDLC lateral-deviation downlink or voice "WEATHER DEVIATION REQUIRED" (priority) · "PAN PAN" if needed. The rules below apply ONLY while a clearance cannot be obtained (NAT Doc 007 §10.4.6).

    5 NM 5 NM CLEARED TRACK — DIRECTION OF FLIGHT → CB LEFT of track ≥5 NM → DESCEND 300 ft ▼ RIGHT of track ≥5 NM → CLIMB 300 ft ▲ <5 NM: keep the ATC-assigned level
    Without clearance (§10.4.6): deviate away from the OTS if possible · broadcast callsign, FL, position and intentions on the frequency in use and 121.5 (backup 123.45), lights ON, watch ACAS · <5 NM: keep assigned level · crossing ≈5 NM: LEFT descend 300 ft / RIGHT climb 300 ft (Table 13-1) · cleared to a distance and need more: apply the ±300 ft BEFORE exceeding it · returning: be at the assigned level within 5 NM of the centreline · keep trying to get the clearance. (V.2025-1.1)

    Inflight contingency procedure

    CLEARED TRACK ≥ 30° 5 NM ± 500 ft (1,000 ft above FL410) consider below FL290 💡 ALL LIGHTS ON 📻 BROADCAST 123.45 · GUARD 121.5 → DIVERT
      Remarks — EDM

      Checks and recorded values are cleared by "New crossing"; item texts, remarks you edited, Tail Number and Crew are kept.

      NAT-HLA operational checklist from the operator's own documentation, with remarks.
      Support tool — it does not replace the AFM/AOM, the NAT Doc 007, current OACs' procedures or the captain's judgement. Confirm windows and frequencies in the current publications.
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