Tag Archives: MOB Device

Cheeki Rafiki. Lesson Learned.

The MAIB Report on the Cheeki Rafiki tragedy just came out a couple of weeks ago. There is a lot of talk on the forums (SA especially) about precisely what happened to the boat to allow the keel to separate and take four lives.

But that’s not the real lesson of this tragedy as far as I’m concerned. How you get in the water is not relevant. What happens when you’re there is. Here is one of the more sobering aspects of the MAIB:

RCC Boston calculated the estimated survivability of the crew members based on their average descriptions, assuming that they were dressed in full foul weather sailing gear, immersed to the neck in water and wearing a personal flotation device (PFD). Using these criteria, the estimated functional survivability and survival times were 12.3 hours and 15.5 hours respectively.

Using similar parameters but assuming that the crew members had been submerged  to the waist in water, sitting in a liferaft in heavy weather, produced estimated functional survivability and survival times of 14 hours and 21 hours respectively.

RCC Boston also calculated the probability of success (POS) of finding the following objects based on the probability of containment (POC) for the areas searched, and the probability of detection (POD) from searching those areas:

POS for a person in the water with a PFD: 6%

POS for a swamped/capsized boat: 95%

POS for an upright liferaft: 82%

POS for a capsized liferaft: 92%

Think about that while planning your next trip. Please.

We will.

Big Freakin’ Safety Gear

We’ve been busy assembling our various pieces of additional safety gear for our upcoming trip to Florida in June. Now, granted, some may think we’re overdoing it for the kind of sailing we will be doing over the next few years…ICW, Gulf of Mexico, and the Caribbean. But my goal has been to outfit Dawn Treader such that she is also ready for some off-shore racing if and when we decide to do it. So I’ve been following the ISAF/OSR Category 1 regulations as much as possible. Now, granted, I’m not a stickler. For example, I don’t plan to completely replace my coated lifelines right now. There are too many other places to put smarter money and time. But I want to get as close as possible to these regulations – and will continue to do so more and more as we go. Bottom line: If you’re going to be off-shore at all, it makes no sense not to follow these proven guidelines. Continue reading Big Freakin’ Safety Gear