A family was winched off Elizabeth Reef at 4am. The night passage habits that stop a reef strike

On Saturday 19 September a 10 m yacht with two adults and two kids aboard, 9 and 12, hit a reef north of Elizabeth Reef, about 120 km off the Whitsunday coast, in the dark. By the time the rescue helicopter from Mackay had the last of them on the wire the boat was nearly under. The skipper's line afterwards was that the reef is on the paper chart and not on the electronic one, and that the plotter was showing deep water when they hit. Most of the fleet going north to Fiji in May or south in November does it at night, on a plotter, over coral surveyed from a rowing boat. So this one is about the reef strike on a night passage, and the habits we use to stay off the bricks.

What happened north of Elizabeth Reef

What the reports agree on:

• A family of four left the Whitsundays bound for the Herald Cays, 180 nautical miles to the north, in a 10 m yacht.
• They struck a reef north of Elizabeth Reef, roughly 120 km off the mainland, early on Saturday 19 September 2026. The ABC has it at about 4am, the local paper at 1am with six hours on the reef. We don't know which is right.
• They put out a mayday on the sat phone and set off their beacon. An AMSA jet, a rescue vessel out of Airlie Beach and the CQ Rescue helicopter from Mackay responded.
• The boat was listing about 60 degrees with the keel on the reef and the swell dropping her back on it. A rescue swimmer went down and the four were winched up one at a time. Father to Proserpine Hospital with head injuries, the rest unhurt.
• The skipper told the local paper that the reef was on the paper charts but not on the electronic charts, and that the plotter was showing deep water. One report says 20 m plus.

Coverage: ABC and Mackay and Whitsunday Life.

What we don't know: the make of yacht, which chart brand was in the plotter and how old the card was, the zoom level, whether a paper chart was open, or who was on watch. So none of this is a judgement on that crew. We are not immune to any of it. This is what we do.

The chart was probably right. The screen was not

Two things go wrong near coral at night and people lump them together. The first is the plotter. A vector chart decides what to show you based on zoom level, and when you are zoomed out to look at the next 50 miles it quietly drops the small stuff. That is how Team Vestas Wind, a fully crewed Volvo Ocean Race boat, ran onto the Cargados Carajos shoals at speed in 2014. The navigator had the chart at a scale where the reef was a box saying a larger scale chart existed. Yachting Monthly went through the report. The lesson for a family cruiser is the same as for the pros: check every danger at the largest scale, along the whole track, before dark. Not on watch when it comes up.

The second is the survey under the chart. Your GPS knows where the boat is to about 5 m. The reef was drawn from whatever survey the hydrographic office had, and out past the shipping lanes that survey was often positioned by sextant, which puts it anywhere from 50 to 500 m out. Charts carry a grade for this called the zone of confidence, A1 down to D and U. The wording in the low grades is plain: for C, position accuracy 500 m and depth anomalies may be expected, for D, worse than that and large depth anomalies may be expected, for U, not assessed at all. The IHO says about 55 percent of the world's coastal waters sit in C, D or U. It is all in their mariners' guide to chart accuracy. Most plotters will show the zone of confidence if you turn the layer on. Almost nobody does. In a C or D area the only sensible plan is a lookout, daylight and settled weather, or go somewhere else.

In Fiji it is worse. Charts for parts of the Lau Group rest on surveys from 1876 to 1879, and cruisers have measured charted reefs more than half a mile from where the satellite picture puts them. At night half a mile is the difference between a clean pass and the helicopter.

Satellite imagery, and what it doesn't tell you

Plenty of cruising boats load satellite imagery into OpenCPN or SAS Planet, or run Google Earth on a tablet with the GPS feeding it. A reef shows as a pale ring in dark water, a lagoon shows its bommies, and a pass shows where the dark channel actually runs. Line it up against the chart and any offset jumps out. This piece covers the set-up and the 0.56 mile error one crew found on a Fijian lagoon entrance.

What it doesn't do:

• Depth. A pale patch might be 1 m or 6 m. You cannot tell from space.
• Anything under cloud or sun glare on the day the image was taken.
• Position. The image itself can be out by metres. One example in that article had a 15 m error in a 15 m channel.
• Age.

So imagery is a second opinion. Chart and imagery both clear, we carry on. Chart clear and imagery shows a pale patch, we go round it in daylight or not at all. Chart shows a reef and imagery shows nothing, the reef wins. The screen with the danger on it is the one we believe.

Standing off till daylight

This is the habit that costs the most and saves the most. Every landfall we make on a reef coast, Fiji going north or Minerva going south, is planned to happen with the sun up and behind us. If the numbers say 2am, we slow the boat down. From 200 miles out, not 20. On a cat that is easy: two reefs and a scrap of jib and she trundles along at four knots. If we have misjudged it and the reef is 15 miles off at midnight, we heave to or jog in open water with room to leeward and wait.

The hard part is not the sailing, it is talking yourself into waiting. The crew are tired, the anchorage is right there on the screen, and the screen says 20 m. Four in the morning is the worst hour of the passage: the watch is at the end of it, dawn is a couple of hours off, and everyone has been staring at the same glow for days. We don't know what that family's plan was and we are not going to guess. Three hours at four knots is cheap.

Why we don't enter passes at night

Not the lit ones, not the ones we have been through before. A pass needs the sun high enough to read the colour of the water, because the chart and the imagery only get you to the entrance. Inside, the coral moves, leading marks go missing in a cyclone, and the channel from last season is shallower this one.

Minerva Reef is where that habit gets tested every year, because it is the one stop on the run south and it arrives when it arrives. The lagoon sits two thirds of the way from Fiji to New Zealand, there is nothing else for hundreds of miles, and the entrance wants daylight and settled weather. Wrong timing, we sit outside. The reef, the anchorage and how we use it to re-time the passage are in the Fiji to New Zealand passage guide.

Mā Tori draws 1.1 m, which sounds like a licence to cut corners. It is the opposite. A cat with that draught sits on a reef rather than sliding off, and the hull build in the Fusion 40 review was never meant for that.

Our night passage habits, in order

1. Before dark, zoom in along the whole track. Largest scale, the full night's run, every danger within 10 miles either side written on the plan with a distance off.
2. Check the zone of confidence. Anything graded C, D or U gets more room than the chart says it needs, and the route goes round it through open water.
3. Miles, not cables. A passing distance you could measure in boat lengths is inside the error of the survey. In the dark we route past reef corners by miles.
4. Two sources open. The plotter and either satellite imagery or a second chart brand on the tablet. When they disagree, believe the one that puts the reef closer.
5. The sounder is not a warning. On a steep coral wall it goes from no reading to 2 m in a boat length. The depth alarm is for shelving bottoms, near coral it goes off after you have hit.
6. Arrive after sunrise, planned from 200 miles out. Slow early. Heave to if you have to.
7. Beacon and sat comms where the watchkeeper can reach them. That family's sat phone mayday and beacon are what got a helicopter to them. Keep yours where the person on watch can reach them, not in a locker under a bunk. The rest of the abandon ship kit is in the whale strike post.
8. A fresh head on the 2 to 5 watch. The person closing the reef in the small hours should not be the one who has been up since dinner. Our watch builder shows how much sleep each rota actually gives.

Chart corrections, beacon registration and the rules on reporting a grounding all change. Check the current Australian Hydrographic Office notices and AMSA's beacon requirements before relying on any of this.

Questions people are asking this week

Can you trust a chart plotter near reefs at night?

Not on its own. The position is accurate to metres, the reef was drawn from a survey that might be a century old, and a vector chart drops small dangers when you zoom out. Zoom in along the track before dark, check the zone of confidence, open a second source, and believe whichever puts the reef closer.

Does satellite imagery show reefs?

Well enough to catch a charting error. It does not show depth, it is blank under cloud or glare, and the image itself can be metres out. A second opinion, not a chart.

What do you do if you arrive at a reef pass at night?

Stay outside. Slow down from a long way out so you arrive after sunrise, and if you get there early anyway, heave to or jog in open water with sea room to leeward until the sun is high enough to read the water.

Keep reading: the timing and the Minerva stop are in the Fiji to New Zealand passage guide, the survey checklist is in the Catamaran Buyer's Pack, and our bluewater catamaran for sale is the boat this was written from.