Nhlnut - they know. She is on the fence about it, but his ego won't let him hear any of my warnings.
nn99 - it's sailing slang for getting hit by a wave such that water enters the boat.
Here's an example of one of the many dumb things. We approached the Hermit Islands from the east. There is a massive reef covering almost all points of entry from that direction, other than a small 10 meter wide cut. The cut is the only feasible way inside the reef from that direction. Once through that cut, you need to turn about 90° hard to starboard, move up to a second larger cut, then 90° hard to port to go through the second inner cut. Think of it as two rings, one inside the other, with an opening on the inner ring that is just north of the opening on the outer ring. If you miss either cut, you're going to hit the reef.
So you would think you want maximum visibility for this, right? You want someone as high as possible as a spotter, and you want to enter with minimal sun glare. This means a mid day approach with someone in the crow's nest. You also want to enter at high tide to maximize water depth.
They instead decided (against my explicit warning) to enter just after dawn, with two spotters in the exact same place on the bow. This meant close to maximum glare on the surface due to the angle of the sun, as well as spotters about as low as you can get them, minimizing visibility. Tide wasn't ever even considered.
When approaching the cut, I pointed out the channel marker, which was a pole sticking up out of the water in the middle of the cut. They immediately told me that it was a reef "danger" marker and we needed to stay far away from it. I was almost speechless at that assessment because you could literally watch the waves breaking everywhere along the reef except for where the cut was. It was blindingly obvious that the pole was a channel marker.
So we get close to the cut and they finally realize based on the breaking waves that the only place they could enter was the cut. They decided to enter the cut as close to the reef as possible, staying as far as they could from the channel marker. I was in actual disbelief of this despite being there and seeing it with my own eyes.
Once through the first cut, they knew from the chart that they needed to go hard to starboard to make it up to the second cut, but once they turned, low and behold, there were TWO channel markers ahead of them marking both edges of the second cut. I told them to head for those markers, but they decided these were reef "danger" markers to be avoided at all costs, and instead just turned right back to port, determined to somehow make their way through the reef. Of course, about 90 seconds later they hit the reef and got stuck on it. Then blew the engine trying to fruitlessly reverse off. Then he blamed me for "giving bad directions" lol. Only I got blamed, despite her standing right next to me doing the same useless thing. Once he decided to avoid the second cut, the boat was 100% ending up on the reef, it was just a matter of when.
Oh, and I forgot to mention they were driving the boat at a good 3kts during this entire exercise, about six times as fast as they should ever try to negotiate something like that.
This is what being stuck on a reef looks like when you look down: