Duke Islands Sailing Guide
Duke Islands sailing guide. The Duke Islands lie south of the Percy group and north of Broad Sound, forming a scattered offshore chain that works as the natural transition zone between the Whitsundays–Percy route and the long, empty run toward Shoalwater Bay and the Capricorn Coast. The islands are steep, rugged, and reef‑fringed, with the western sides offering the only dependable shelter in the trade‑wind regime. Eastern faces are exposed to Coral Sea swell and are rarely workable except in calm weather. The group is remote, uninhabited, and used almost entirely for overnight staging and weather waiting rather than as a destination.
Across the region the underwater profile is consistent. Offshore depths generally sit between 24–50 m, tightening to 12–20 m near the shoreline, with anchoring depths mostly in the 6–14 m band over firm sand or sand‑and‑coral mix. Fringing reef rises from 3–6 m, usually confined to the headlands, and isolated coral heads lifting into 2–3 m appear in the fair‑weather pockets. The islands sit in open water and tidal streams run predictably between them, with a mild but noticeable set in the inter‑island channels.
Duke Islands Sailing Guide
For practical cruising, the Duke Islands region covers Hunter Island, Marble Island, Tynemouth Island, Hexham Island, Knight Island, Hunter Rock and the minor islets and reefs that sit between the Percy Islands to the north and Broad Sound to the south. They behave as a single operational unit: similar depth profiles, similar reef patterns, and the same reliance on western anchorages in SE–E trades.
Duke Islands Sailing Guide - Hunter
Island
Hunter Island is the northern entry point when arriving from the Percy Islands and is often the first stop when you drop down from South or Middle Percy. Its western bay is the primary anchorage, with a wide sand basin and a clean, predictable depth gradient. Offshore depths of about 26–40 m ease into 12–18 m near the shoreline, then flatten into 6–12 m over firm sand inside the anchoring zone. The bay is well protected in SE–E winds, with only a light roll in SW–W swell and full exposure in N winds.
The eastern side of Hunter is steep and reef‑bound, with narrow shelves and no workable anchoring bands. It is used purely for transit, and approaches are best kept offshore where depths remain in the mid‑20s and deeper.
Duke Islands Sailing Guide - Marble
Island
Marble Island is the largest and most versatile of the Duke group and effectively the regional hub. Its western anchorage is deep, open, and strongly protected in SE–E winds, with offshore depths of 28–46 m compressing to 14–20 m near the island and anchoring depths of 8–14 m over firm sand. The island’s bulk throws a solid lee, making Marble West the best weather‑waiting option in the Dukes and a natural staging point for longer hops north or south.
A small pocket on the north‑western side can be used in calm conditions, with slightly shallower depths and a tighter swing circle, but it is strictly fair‑weather. The eastern face of Marble is steep, reef‑fringed and fully exposed to swell, with no practical anchoring room
Duke Islands Sailing
Guide - Tynemouth Island
Tynemouth Island is smaller and more abrupt than Marble or Hunter, with a single workable anchorage on its western side. Approaches are straightforward from the west, with offshore depths around 24–36 m shoaling to 12–18 m near the island and then into 6–10 m over sand in the anchoring area. The bay is comfortable in SE–S winds but more open than Marble or Hexham, so it feels livelier in fresh trades and is not ideal for extended weather‑waiting.
The eastern side is steep, reef‑fringed and used only for transit. Depths drop quickly from the mid‑20s into deeper water, and the reef edge is narrow, with no sand basins or swing room.
Duke Islands Sailing
Guide - Hexham Island
Hexham Island is the most dramatic of the group, rising sharply from deep water and offering a large, quiet anchorage on its western side. Offshore depths of 30–50 m reduce to 14–20 m near the shoreline, with anchoring depths of 8–14 m over firm sand. The bay is well protected in SE–E winds and is often chosen by skippers preparing for the long run south toward Broad Sound or north back to the Percy Islands. The holding is reliable, the swing room generous, and the reef is mostly confined to the headlands.
The eastern side of Hexham is steep and reef‑bound, with narrow shelves and immediate swell exposure. It is transit‑only and best given a wide berth in fresh trades.
Duke Islands Sailing
Guide - Minor islets and rocks
Knight Island, Hunter Rock and the smaller Thirsty Sound islets are steep, narrow and fully reef‑fringed. Offshore depths fall quickly from roughly 24–40 m to 10–16 m near the reef edge, and inside the reef the seabed rises into 2–4 m over coral and rock. None of these features offer anchorage in any conditions. They function purely as visual references and waypoints when shaping courses through the region.
Duke Islands Sailing
Guide - Navigation
Navigation through the Duke Islands is straightforward in settled weather. Reef shelves are easy to read in good light, and the western approaches to the main anchorages are deep, clean and predictable. The safest lines are always central approaches from the west, where the depth gradient is smooth and the bottom is predominantly sand. Eastern faces of all islands should be treated as transit‑only, particularly in fresh SE–E winds when swell wraps around the headlands and breaks on the reef edges.
Tidal streams are moderate, with a noticeable but manageable set between islands. Low sun angles can obscure coral heads in the fair‑weather pockets, so late‑day arrivals should be handled conservatively.
Duke Islands Sailing
Guide - Weather
The Duke Islands sit squarely in the SE trade‑wind regime, with typical seasonal winds in the 15–25 knot range. The western anchorages at Hunter, Marble and Hexham remain workable and often comfortable in these conditions, while Tynemouth feels more exposed but still serviceable. All anchorages become progressively more uncomfortable as the wind moves into the north, and N–NE winds can render the region unattractive for overnight stops.
Swell intrusion is minimal on the western sides in normal trades but immediate on the eastern faces. Tidal range is moderate, and streams in the inter‑island channels are predictable and rarely hazardous, but they do need to be factored into close‑quarters work near reef edges.
Duke Islands Sailing
Guide - Fishing
Fishing around the Duke Islands is shaped by deep water, reef edges, and the open‑ocean environment that surrounds the group. Unlike the estuarine, tide‑driven fishery inside Thirsty Sound, the Dukes behave as a classic offshore island system where structure, current lines, and reef contours dictate everything. The western sides of Marble, Hexham, Hunter, and Tynemouth sit in the lee of the trades and often hold bait, especially when the tide slackens and the water settles. The eastern faces are more exposed, with stronger current flow and cleaner water, and they tend to produce the more pelagic species when conditions allow. Coral trout, sweetlip, tuskfish, and cod are the main reef species, holding tight to the bommies and ledges that fringe the islands, while Spanish mackerel, queenfish, trevally, and the occasional tuna work the pressure edges and bait schools offshore.
The fishing is generally best on the turn of the tide, when the current eases enough for fish to move up onto the structure, and again on the first push of the flood when bait lifts off the bottom. The water is clear enough that fish respond well to both bait and lures, but the reef edges are unforgiving, and most skippers fish from the dinghy rather than the yacht to stay mobile and avoid anchoring too close to the coral. The deeper water between the islands holds pelagics on the right day, especially around Hexham and Marble where the current lines are strongest, while the shallower shelves near Hunter and Tynemouth produce consistent reef fish when the wind drops out. Ciguatera risk exists in the region, as it does across much of the central Queensland reef belt, and large coral trout, Spanish mackerel, and reef predators should be treated with caution. Overall, the Duke Islands offer a productive, structure‑driven offshore fishery with a mix of reef species and pelagics, best worked from a dinghy, best timed around the tide, and best approached with the same respect you give the reefs themselves.
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Resource
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Duke Islands Sailing
Guide - Summary
The Duke Islands form a rugged offshore stepping stone between the Percy Islands and Broad Sound, offering a handful of deep, reliable western anchorages and a scattering of transit‑only rocks and islets. Marble Island provides the best all‑round shelter and is the natural weather‑waiting hub, while Hunter and Hexham offer equally dependable but smaller alternatives. Tynemouth is workable but more exposed, and the minor islets are purely visual marks. The region is simple to navigate, entirely skipper‑intent, and best thought of as a staging ground rather than a cruising destination. The Duke Islands Sailing Guide for practical advice you need.