[{"data":1,"prerenderedAt":182},["ShallowReactive",2],{"leaderboard-total":3,"spot-masthead-reef":9,"spot-seo-masthead-reef":147},{"entries":4,"total":5,"period":6,"type":7,"generated_at":8},[],0,"all_time","reports","2026-10-03T06:32:05.526386Z",{"id":10,"name":11,"slug":12,"latitude":13,"longitude":14,"description":15,"difficulty":16,"image_url":17,"status":18,"tide_constituents":19,"hazard_entries":70,"access_info_structured":84,"area_boundary":17,"routes":17,"created_at":88,"updated_at":89,"today_conditions":90,"today_verdict_view":112,"images":142,"submitted_by":143,"region_name":145,"verification_status":146,"verified_at":17,"disputed":140,"verifier_count":5,"last_verified_display_name":17},"93c5eda3-d22b-4912-82b1-708b0e08fb6f","Masthead Reef","masthead-reef",-23.524943,151.729809,"Masthead Reef is a pristine, moderately large platform reef encircling Masthead Island, a protected coral cay in the Capricornia Cays National Park, 60 km northeast of Gladstone. One of the least disturbed cays in the southern Great Barrier Reef, the reef is partially exposed at low tide, revealing a stunning platform of coral gardens, bommies, and sandy channels. The site offers exceptional snorkelling over healthy coral formations with excellent visibility. Its remote, low-impact designation means fewer crowds and a truly wild reef experience. The reef is also known historically as Polmaise Reef, site of the 1868 Waterwitch shipwreck.","intermediate",null,"published",{"name":20,"amplitude":36,"phase":52,"latitude":13,"model":68,"epoch":69},[21,22,23,24,25,26,27,28,29,30,31,32,33,34,35],"2N2","J1","K1","K2","M2","M4","MF","MM","N2","O1","P1","Q1","S1","S2","T2",[37,38,39,40,41,42,43,44,45,46,47,48,49,50,51],0.03224772392673265,0.015942013745197613,0.25800119141284056,0.09817361018427716,0.9192511392984128,0.007145586233348588,0.0044137342270631425,0.003407584676829787,0.21831581142962153,0.13580341197225204,0.07240080042032009,0.02745348231156235,0.00816472481459802,0.33676117721131904,0.01978350469814584,[53,54,55,56,57,58,59,60,61,62,63,64,65,66,67],305.88179664561824,25.43334236359176,5.960062851137521,316.1896159291296,321.9877828447453,242.24437020032804,11.573279817791185,71.13333227182444,314.0518745002514,337.5332649341618,1.8556637674988494,316.58193129296916,324.7780494781498,320.5002827090058,308.04485286818317,"EOT20","1992-01-01T00:00:00Z",[71,75,78,81],{"name":72,"description":73,"severity":74,"season_start":17,"season_end":17},"Exposed coral platform at low tide","Parts of the reef platform are exposed at low tide, creating shallow rocky areas that can cause injury to unprotected skin. Snorkellers should wear reef shoes and be mindful of tidal timing.","caution",{"name":76,"description":77,"severity":74,"season_start":17,"season_end":17},"Marine stingers (jellyfish)","Stinging jellyfish (box jellyfish and Irukandji) are present in the southern Great Barrier Reef waters, typically during the warmer months from November to May.",{"name":79,"description":80,"severity":74,"season_start":17,"season_end":17},"Tidal currents across reef platform","Tidal currents can flow across the reef platform, particularly during spring tides. Snorkellers should exercise caution and stay near the cay edge.",{"name":82,"description":83,"severity":74,"season_start":17,"season_end":17},"Remote location — limited emergency access","Remote location with no on-site medical facilities. The nearest emergency services are on Heron Island or in Gladstone, requiring boat or helicopter evacuation.",{"directions":85,"parking":86,"facilities":17,"fees":17,"access_method":87},"Masthead Reef is located about 60 km northeast of Gladstone, Queensland. Access is by private boat or via charter tours from Gladstone, often operated in conjunction with trips to nearby Heron Island. The reef surrounds Masthead Island, a coral cay in the Capricornia Cays National Park.","No parking at the reef itself. Vehicle parking is available at Gladstone Marina or other departure points in Gladstone for boat charters and private vessels. Overnight camping on Masthead Island requires a permit from Queensland Parks and Wildlife Service (QPWS). No vehicle access on the island.","boat","2026-07-27T02:54:00.105550Z","2026-08-04T05:34:24.990792Z",{"verdict":91,"evaluated_at":92,"models":93},"go","2026-10-03T02:18:26.235677Z",[94,101,106],{"model_name":95,"is_favourable":96,"value":97,"threshold":98,"unit":99,"operator":100},"Wind Speed",true,1.03,10,"kn","lte",{"model_name":102,"is_favourable":96,"value":103,"threshold":104,"unit":105,"operator":100},"Wave Height",0.052,0.5,"m",{"model_name":107,"is_favourable":96,"value":108,"threshold":109,"unit":110,"operator":111},"Visibility",3,2,"","gte",{"verdict":91,"rating":113,"evaluated_at":92,"generated_at":92,"source":114,"confidence":115,"visibility":118,"parameters":119,"models_passed":141,"models_total":135},"Excellent","precomputed",{"level":116,"value":117},"High",100,{"score":108,"rating":17,"confidence":17},[120,123,129,132,137],{"name":102,"value":121,"label":17,"unit":105,"favourable":96,"score":108,"optimal_max":104,"marginal_max":122},0.052000000000000005,1,{"name":124,"value":125,"label":17,"unit":126,"favourable":96,"score":108,"optimal_max":127,"marginal_max":128},"Swell Period",5.65,"s",8,12,{"name":95,"value":130,"label":17,"unit":99,"favourable":96,"score":108,"optimal_max":98,"marginal_max":131},1.03217904,15,{"name":133,"value":5,"label":17,"unit":134,"favourable":96,"score":108,"optimal_max":135,"marginal_max":136},"Precipitation","mm",5,20,{"name":138,"value":17,"label":139,"unit":110,"favourable":140,"score":122,"optimal_max":17,"marginal_max":17},"Tidal Phase","flood",false,4,[],{"display_name":144},"Daniel","Queensland","unverified",{"title":148,"description":149,"canonical_url":150,"og_image":151,"structured_data":152,"breadcrumbs":175},"Snorkeling Conditions at Masthead Reef - How's the Spot","Check snorkeling conditions at Masthead Reef, Queensland. Excellent conditions, water 22.8°C, waves 0.05m","https:\u002F\u002Fhowsthespot.com\u002Fspots\u002Fmasthead-reef","https:\u002F\u002Fhowsthespot.com\u002Fog-default.png",[153,162],{"@context":154,"@type":155,"name":11,"description":156,"url":150,"geo":157,"address":159},"https:\u002F\u002Fschema.org","Place","Masthead Reef is a pristine, moderately large platform reef encircling Masthead Island, a protected coral cay in the Capricornia Cays National Park, 60 km northeast of Gladstone. One of the least d...",{"@type":158,"latitude":13,"longitude":14},"GeoCoordinates",{"@type":160,"addressRegion":145,"addressCountry":161},"PostalAddress","Australia",{"@context":154,"@type":163,"name":164,"description":149,"url":150,"breadcrumb":165},"WebPage","Snorkeling Conditions at Masthead Reef",{"@context":154,"@type":166,"itemListElement":167},"BreadcrumbList",[168,172,174],{"@type":169,"position":122,"name":170,"item":171},"ListItem","Home","https:\u002F\u002Fhowsthespot.com",{"@type":169,"position":109,"name":145,"item":173},"https:\u002F\u002Fhowsthespot.com\u002Fexplore?region=queensland",{"@type":169,"position":108,"name":11,"item":150},[176,178,180],{"label":170,"href":177},"\u002F",{"label":145,"href":179},"\u002Fexplore?region=queensland",{"label":11,"href":181},"\u002Fspots\u002Fmasthead-reef",1791009173214]