South Percy Island Sailing Guide
South Percy Island sailing guide. South Island sits immediately south‑west of South Percy Island and forms one of the smallest, steepest, and most exposed outliers in the Percy Islands. It is rocky, narrow, and fully reef‑fringed, with no workable anchorage in any trade‑wind conditions. The island is used solely as a transit waypoint or visual reference when navigating between South Percy, Middle Percy, and the northern approaches to Shoalwater Bay. There are no beaches, no landing sites at low tide, and no sheltered water.
The underwater profile around South Island is abrupt, with offshore depths of 26–40 m reducing rapidly to 10–16 m near the reef edge. Inside the reef margin, depths rise to 2–4 m over coral and rock. The island is fully exposed to SE–E trade winds and receives swell from all quadrants except the west. South Island is therefore classified as transit‑only.
South Percy Island
Sailing Guide
South Island lies just south‑west of South Percy and is one of the most exposed landforms in the group. It rises sharply from deep water and is surrounded by continuous fringing reef. Offshore depths remain consistently 26–40 m, reducing to 10–16 m near the reef edge. Inside the reef, depths rise to 2–4 m over coral. There are no sand basins, no swing room, and no safe anchoring opportunities.
The island is used only as a navigation mark when approaching South Percy from the south or when shaping a course toward Shoalwater Bay.
No Anchorage – All
Sides
South Island has no workable anchorage on any side. The reasons are consistent around the entire islet:
- Fringing reef: continuous, rising from 3–6 m
- No sand basins: seabed is rock, coral, or rubble
- Depth profile: offshore 26–40 m, near‑shore 10–16 m, inside reef 2–4 m
- Exposure: open to SE–E trades, N winds, and wrap‑around swell
- Swing room: effectively zero
Even in calm weather, the reef edge is too shallow and too narrow to safely anchor without risk of grounding or coral damage.
South Percy Island
Sailing Guide - Coastal Features
Western Side (Most Approachable – Still No Anchorage). The western side is the most approachable but still unsuitable for anchoring. Offshore depths of 26–34 m reduce to 10–14 m near the reef edge. The fringing reef rises from 3–6 m, with coral heads lifting into 2–3 m. This side is used only for visual transit when approaching South Percy or shaping a course toward Shoalwater Bay.
Northern Side. The northern side is steep and fully reef‑fringed. Offshore depths of 28–36 m reduce to 12–16 m near the reef edge. Coral heads lifting into 2–3 m are frequent. This side is exposed to N–NE winds and receives swell from the Whitsunday Passage.
Eastern Side. The eastern side is exposed to Coral Sea swell and is the most hazardous. Offshore depths of 30–40 m reduce to 14–18 m near the reef edge. The fringing reef rises abruptly from 3–6 m, with isolated coral heads in 2–3 m. This side is used only for transit and should be avoided in fresh SE–E winds.
Southern Side. The southern side is steep, rocky, and fully reef‑bound. Offshore depths of 28–36 m drop quickly into deeper water, and the fringing reef rises from 3–6 m. Swell wraps around the headlands in SE–E winds, making this side particularly rough.
South Percy Island
Sailing Guide - Navigation Notes
Navigation around South Island is simple but requires caution due to shallow reef shelves and breaking water at mid‑to‑low tide.
Depths and Seabed
- Offshore depths: 26–40 m
- Near‑shore depths: 10–16 m
- Inside reef: 2–4 m
- Fringing reef: 3–6 m, continuous
- Coral heads: 2–3 m, common on all sides
Operational considerations
- Tidal streams are moderate, with noticeable set between South Percy and the islet.
- Reef edges are visible in good light but difficult to read in chop or low sun.
- Avoid close approaches in SE–E winds due to wrap‑around swell.
- Use South Island only as a visual reference when transiting the group.
South Percy Island
Sailing Guide - Weather
South Island is fully exposed to the SE trade‑wind regime, with winds commonly 15–25 knots during the season.
- Shelter: None
- Exposure: All sides in SE–E winds
- Swell: Immediate intrusion from all quadrants
- Tidal range: Moderate, with predictable streams
The islet is not suitable for anchoring in any wind direction. I am sure some will attempt it just to say you can, good luck with that and well done if successful.
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Resource
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South Percy Island
Sailing Guide - Summary
South Island provides no anchorage and is used solely as a transit waypoint within the Percy Islands. Continuous fringing reef, shallow depths, and full exposure to trade winds make anchoring challenging if not impossible. The islet functions as a visual reference for vessels moving between South Percy, Middle Percy, and offshore routes toward Shoalwater Bay or the Whitsundays.