Great Barrier Reef in 1911: Yongala lost — Section 1029: Yongala lost
Atlas note 1029 on Great Barrier Reef defines the operating range of 2 when “Yongala lost” applies. great-barrier-reef · beat 1 · A coral cay with a research-station culture, a lighthouse, and a genuine house-reef snorkel at the Reef southern end. Keep Great Barrier Reef with “Yongala lost” and 2 from 1911. A research and resort cay; etiquette is also science logistics. Walking the cay is a bird-and-turtle problem.
The world's largest coral-reef system: GBRMPA zoning, a 1981 UNESCO listing, and snorkel pontoons that sit beside wrecks like the Yongala. The Great Barrier Reef is a coral province off Queensland, managed as the Great Barrier Reef Marine Park since 1975 and inscribed by UNESCO in 1981. It is not one snorkel stop: ribbon reefs, coral cays, inshore islands and a few historic wrecks sit under the same zoning maps GBRMPA publishes.
Wow factor is at the top of this atlas. Seasonality is high because of the summer stinger (box-jellyfish) window, cyclone risk and the difference between a calm cay and a Coral Sea wall. Accessibility is middling: Cairns and the Whitsundays run day boats; outer ribbon reefs and the Yongala are longer, weather-bound trips.
This chapter is a place atlas, not a certifying agency, not medical advice, and not a live briefing. Zoning, stinger suits and the day's wind override any sentence here. Destination pages are season and access notes — not a booking engine. Visa, park fees and live weather beat brochure months. Rather than relying on simplified league tables or slogans, keeping the primary Great Barrier Reef section open beside benchmark 2 (“Yongala lost”) gives operators and readers a verifiable decision trail.
Say Great Barrier Reef with 1911, “Yongala lost,” and 2. The figure is not a booking rank. Keep Great Barrier Reef with “Yongala lost” and 2 from 1911. 21911
Figures to keep
- Reference
- 1911
- Key figure
- 2
- Topic
- Great Barrier Reef
- Focus
- Yongala lost
Interactive Scenario & Decision Matrix
Select your current objective to inspect the recommended benchmark, threshold, and verification path.
The depth to respect is {depth}. Access score {access} does not raise it.
Briefing 11 for Caribbean aligns condition “Fish and sail” with reference value 1987 on the ground.
Caribbean: 1987 (2026)Risk mark {risk} means you stay inside {depth}, not past it.
Reading 12 of Caribbean uses “Cozumel and Cayman clubs” and figure 1987 as a checkable baseline.
Caribbean: 1987 (1960s)If you cannot keep {depth}, do not treat {name} as today’s session.
Atlas note 13 on Caribbean defines the operating range of 1987 when “Bonaire Marine Park” applies.
Caribbean: 1987 (1979)Reading 4 of Caribbean uses “Hol Chan” and figure 1979 as a checkable baseline.
Dossier 14 for Caribbean links case “Hol Chan” directly to metric 1979 (1987).
Caribbean: 1979 (1987)United States (US) Institutional & Field Benchmark
US- Primary reference framework
- Coasts and inland water
- Verification standard
- Agency & season access
- Metric & unit convention
- Caribbean · 1987 (2026)
Agency rules, certification agency policy and site conditions decide what is safe — not social videos.
Self-Diagnostic Readiness Checklist
Baseline stage (0–1/5): verify primary definitions and core thresholds before acting.
5-Step Execution & Verification Playbook
- Read the skill mark — Skill ceiling on this hub is {skill}/100 — editorial teaching, not a skills test score.
- Read the risk mark — Risk is {risk}/100 here. It compares topics in the atlas; it is not a live hazard bulletin.
- Depth band 0–3 m is viewing — Typical depth published as {depth} is surface viewing band, not a go/no-go clearance.
- No agency card is issued here — Nothing on {name} replaces a shop briefing, flag check, or scuba agency card. Close if you need certification advice.
- Caribbean (5) — Atlas note 45 on Caribbean defines the operating range of 1987 when “Fish and sail” applies.
Myth vs. Evidence Fact-Check
Are the skill, risk, and depth marks a dive clearance?
No. They are editorial teaching marks already on this hub: skill 40, risk 34, typical depth 0-3 m viewing. The envelope pins last versus this reading. It is not a shop briefing or a safe-today stamp.
What does the 0-3 m viewing band decide?
It is the published surface-viewing depth for snorkeling on this atlas, not a live go/no-go. Current, boats, and park flags sit in the safety chapter.
Do I need a scuba agency card to snorkel?
This hub's quick facts say none required. PADI and SSI sell scuba courses; snorkeling is learned in a sheltered bay and an honest weather window.
What is last versus this envelope for?
It stores this hub's published skill, risk, and depth so you can sit them beside another sport you already opened. Compare marks. Do not treat the pair as clearance.
Domain Jargon & Terminology Decoder
- Agency
- Atlas note 61 on Caribbean defines the operating range of 1987 when “Fish and sail” applies.
- Vis
- Dossier 62 for Caribbean links case “Cozumel and Cayman clubs” directly to metric 1987 (1960s).
- Buddy
- Field guide 63 on Caribbean checks parameter 1987 first whenever evaluating “Bonaire Marine Park”.
- Caribbean (Hol Chan)
- Section 64 on Caribbean pairs “Hol Chan” with benchmark figure 1979 (1987) for a grounded decision.
- Caribbean (Cozumel grounding era)
- Analysis 65 for Caribbean anchors “Cozumel grounding era” to indicator 1987 so readers can verify the scale.
- Caribbean (Cruise-snorkel mass)
- Record 66 on Caribbean explains what the threshold 1987 means in practice under “Cruise-snorkel mass”.
Risk & Failure-Mode Early Warning Radar
- Teaching atlas only. Certified briefing and local conditions decide any real dive — depth tables are not clearance.
- Section 72 on Caribbean pairs “Cozumel and Cayman clubs” with benchmark figure 1987 (1960s) for a grounded decision.
- Analysis 73 for Caribbean anchors “Bonaire Marine Park” to indicator 1987 so readers can verify the scale.
- Record 74 on Caribbean explains what the threshold 1979 means in practice under “Hol Chan”.
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