[{"data":1,"prerenderedAt":197},["ShallowReactive",2],{"leaderboard-total":3,"spot-seo-masthead-island-snorkeling":9,"spot-masthead-island-snorkeling":51},{"entries":4,"total":5,"period":6,"type":7,"generated_at":8},[],0,"all_time","reports","2026-10-03T06:32:05.526386Z",{"title":10,"description":11,"canonical_url":12,"og_image":13,"structured_data":14,"breadcrumbs":44},"Snorkeling Conditions at Masthead Island snorkeling - How's the Spot","Check snorkeling conditions at Masthead Island snorkeling, Queensland. Excellent conditions, water 22.8°C, waves 0.05m","https:\u002F\u002Fhowsthespot.com\u002Fspots\u002Fmasthead-island-snorkeling","https:\u002F\u002Fhowsthespot.com\u002Fog-default.png",[15,28],{"@context":16,"@type":17,"name":18,"description":19,"url":12,"geo":20,"address":24},"https:\u002F\u002Fschema.org","Place","Masthead Island snorkeling","Masthead Island is a pristine coral cay in the southern Great Barrier Reef, part of the Capricornia Cays National Park. Surrounded by a fringing reef that partially emerges at low tide, this undist...",{"@type":21,"latitude":22,"longitude":23},"GeoCoordinates",-23.538653,151.726904,{"@type":25,"addressRegion":26,"addressCountry":27},"PostalAddress","Queensland","Australia",{"@context":16,"@type":29,"name":30,"description":11,"url":12,"breadcrumb":31},"WebPage","Snorkeling Conditions at Masthead Island snorkeling",{"@context":16,"@type":32,"itemListElement":33},"BreadcrumbList",[34,39,42],{"@type":35,"position":36,"name":37,"item":38},"ListItem",1,"Home","https:\u002F\u002Fhowsthespot.com",{"@type":35,"position":40,"name":26,"item":41},2,"https:\u002F\u002Fhowsthespot.com\u002Fexplore?region=queensland",{"@type":35,"position":43,"name":18,"item":12},3,[45,47,49],{"label":37,"href":46},"\u002F",{"label":26,"href":48},"\u002Fexplore?region=queensland",{"label":18,"href":50},"\u002Fspots\u002Fmasthead-island-snorkeling",{"id":52,"name":18,"slug":53,"latitude":22,"longitude":23,"description":54,"difficulty":55,"image_url":56,"status":57,"tide_constituents":58,"hazard_entries":109,"access_info_structured":138,"area_boundary":56,"routes":56,"created_at":144,"updated_at":145,"today_conditions":146,"today_verdict_view":165,"images":193,"submitted_by":194,"region_name":26,"verification_status":196,"verified_at":56,"disputed":192,"verifier_count":5,"last_verified_display_name":56},"47a91d3c-ae56-44dd-8323-f89801c3fc51","masthead-island-snorkeling","Masthead Island is a pristine coral cay in the southern Great Barrier Reef, part of the Capricornia Cays National Park. Surrounded by a fringing reef that partially emerges at low tide, this undisturbed cay offers exceptional snorkelling over coral bommies, staghorn patches, and sandy lagoons where turtles, manta rays, and colourful reef fish abound. One of the most untouched cays in the park, Masthead Island is a sanctuary for seabirds and nesting turtles, with a remote, castaway feel that rewards adventurous snorkellers who make the boat journey from the Queensland coast.","intermediate",null,"published",{"name":59,"amplitude":75,"phase":91,"latitude":22,"model":107,"epoch":108},[60,61,62,63,64,65,66,67,68,69,70,71,72,73,74],"2N2","J1","K1","K2","M2","M4","MF","MM","N2","O1","P1","Q1","S1","S2","T2",[76,77,78,79,80,81,82,83,84,85,86,87,88,89,90],0.03226779190975547,0.015872205838247687,0.2575687023590528,0.09819974311251244,0.9199667249323228,0.007168831495819053,0.004380218155541322,0.0034283319242526342,0.21843682821709132,0.13557570006857025,0.07228262500383735,0.02742832599419014,0.008235846739024985,0.3367617924813212,0.019836879497937554,[92,93,94,95,96,97,98,99,100,101,102,103,104,105,106],305.682271493664,25.529814986456284,5.885324379131577,316.02884249203674,321.79637688508035,241.45246242264494,11.790571471336646,70.92292066260666,313.85242675657236,337.46058664296805,1.8378772939995682,316.46829412321387,324.30953773186314,320.32643251376567,308.15443746365116,"EOT20","1992-01-01T00:00:00Z",[110,116,120,123,126,129,132,135],{"name":111,"description":112,"severity":113,"season_start":114,"season_end":115},"Seasonal Island Closure (Bird & Turtle Nesting)","The island is closed to the public from mid-October to Easter each year to protect nesting seabirds and turtle hatchlings. Plan visits outside this period.","warning",4,10,{"name":117,"description":118,"severity":119,"season_start":56,"season_end":56},"Exposed Reef at Low Tide \u002F Tidal Currents","The surrounding fringing reef is partially exposed at low tide, creating shallow areas and strong currents over the reef edge.","caution",{"name":121,"description":122,"severity":113,"season_start":56,"season_end":56},"Remote Uninhabited Cay – No Facilities","No facilities, fresh water, or shade on the island. Snorkellers must be fully self-sufficient.",{"name":124,"description":125,"severity":119,"season_start":56,"season_end":56},"Boat Access Only – Tide-Dependent Landing","Access to the island is by boat only and can be restricted by tidal conditions. Reef channels may be hazardous for navigation.",{"name":127,"description":128,"severity":119,"season_start":56,"season_end":56},"Exposed reef at low tide","Parts of the reef are exposed at low tide, creating shallow areas that can cause injury to swimmers or damage to coral if stepped on. Snorkellers should be aware of tide times and avoid standing on coral.",{"name":130,"description":131,"severity":113,"season_start":56,"season_end":56},"Tidal currents","Strong tidal currents can flow through channels around the reef, particularly during incoming and outgoing tides. Snorkellers should be confident swimmers and aware of tide timing.",{"name":133,"description":134,"severity":113,"season_start":56,"season_end":56},"Marine stingers","Marine stingers (box jellyfish and Irukandji) may be present in the waters of the Southern Great Barrier Reef, typically during the warmer months.",{"name":136,"description":137,"severity":113,"season_start":56,"season_end":56},"Seasonal island closure (nesting season)","The island is a protected nesting site for seabirds and marine turtles. The entire island is closed to the public from mid-October to Easter annually to protect nesting birds and turtle hatchlings.",{"directions":139,"parking":140,"facilities":141,"fees":142,"access_method":143},"Masthead Island is located approximately 60 km northeast of Gladstone, Queensland. Access is by private boat or charter from the Town of 1770 (Seventeen Seventy) or Gladstone. The island is part of Capricornia Cays National Park and is accessible by boat only.","No parking on the island. Parking available at boat ramps in Gladstone or Town of 1770.",[],"Camping permits are required from Queensland Parks and Wildlife Service. No commercial accommodation or facilities on the island.","boat","2026-07-27T02:54:00.058777Z","2026-08-04T05:32:31.002411Z",{"verdict":147,"evaluated_at":148,"models":149},"go","2026-10-03T02:20:02.803881Z",[150,156,161],{"model_name":151,"is_favourable":152,"value":153,"threshold":115,"unit":154,"operator":155},"Wind Speed",true,1.03,"kn","lte",{"model_name":157,"is_favourable":152,"value":158,"threshold":159,"unit":160,"operator":155},"Wave Height",0.052,0.5,"m",{"model_name":162,"is_favourable":152,"value":43,"threshold":40,"unit":163,"operator":164},"Visibility","","gte",{"verdict":147,"rating":166,"evaluated_at":148,"generated_at":148,"source":167,"confidence":168,"visibility":171,"parameters":172,"models_passed":114,"models_total":187},"Excellent","precomputed",{"level":169,"value":170},"High",100,{"score":43,"rating":56,"confidence":56},[173,175,181,184,189],{"name":157,"value":174,"label":56,"unit":160,"favourable":152,"score":43,"optimal_max":159,"marginal_max":36},0.052000000000000005,{"name":176,"value":177,"label":56,"unit":178,"favourable":152,"score":43,"optimal_max":179,"marginal_max":180},"Swell Period",5.65,"s",8,12,{"name":151,"value":182,"label":56,"unit":154,"favourable":152,"score":43,"optimal_max":115,"marginal_max":183},1.03217904,15,{"name":185,"value":5,"label":56,"unit":186,"favourable":152,"score":43,"optimal_max":187,"marginal_max":188},"Precipitation","mm",5,20,{"name":190,"value":56,"label":191,"unit":163,"favourable":192,"score":36,"optimal_max":56,"marginal_max":56},"Tidal Phase","flood",false,[],{"display_name":195},"Daniel","unverified",1791009173212]