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I've hijacked David's post from the MAIB report thread to introduce the topic. There been lots of discussion about what alarms to buy. The BSS and CoGDEM have been working the information that hopefully will give more advice. To be absolutely clear it is now possible to purchase certified alarms suitable for boats and having boat installation instructions. The latest packaging for alarms certified to BS EN 50291-2:2010 should have the details. The information on our CO web-pages about where to place CO alarms has been written with and approved by all the major manufacturers who are members of CoGDEM. But before you rush out and buy a new alarm, if you already have an Kitemarked alarm and it was tested to BS EN 50291, or BS EN 50291-1, the CoGDEM/BSS advice is to keep that alarm, test it routinely and when it needs replacing, choose a unit showing it was tested to BS EN 50291-2 and suitable for boat use. Most of the major manufacturer alarms certified and tested to BS EN 50291 are the same products/models now having gone through further testing and are certified to BS EN 50291-2. The later standard takes account of the temperature range, humidity, vibration etc encountered in the marine use. We have published the latest CoGDEM list here CO Alarms for boats advice Please, please, please remember - CO alarms are a backstop, there to help keep you alive should something go wrong. Prevention is the best possible route. These are our ten tips which if followed, should help reduce the risk of CO poisoning on your boat All the crew should know the symptoms of CO poisoning and how to react if it is suspectedInstall fuel burning appliances properly, in-line with makers directionsFollow servicing guidelines; maintenance should be routine and competent - Don't allow bodged repairs, adjustments and adaptationsAlways use appliances as per the instructions and never use cookers for space heating Don’t block ventilation – appliance fuels like gas, coal, wood, oil, paraffin, etc. need sufficient air to burn safelyDon’t bring charcoal BBQs on board, or have them near a cabin during or after use - only stone-cold charcoal is safeKeep engine fumes out of the cabin space, never use a portable generator in or near a cabinLearn about the danger signs, spot potential hazards before CO occursDeal with problems immediately, never use equipment you suspect has problemsInstall a certified CO alarm (BS EN 50291-2), test it routinely and never remove the batteriesI hope this helps everyone who had questions on this topic - and helps people find suitable CO alarms. (Before you ask - we hope to have a similar list of smoke alarms suitable for boats - it's work in progress with the smoke alarm industry)