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I just noticed on your first link this "Abby Sunderland attempted a solo circumnavigation of the world in 2010, hoping to become the youngest person ever to have done so. When her boat was disabled in the south Indian Ocean and her satellite phone was not working, a personal locator beacon...

I agree a PLB is first choice. Its just that the sort of thing of sailing nightmares is you go to use it and nothing happens. You then watch planes fly over and ships go by with out them seeing you. The greatland laser is just useful as you say if they are looking for you. I already have a...

Lasers are already used for emergency use as a distress signal. Google will bring up some times that its been useful eg laserpointersafety.com/news/news/aviation-incidents_files/748574c5aeed480919df641d1cad4d05-487.php Being signalled from the sea rules out some random idiot with a laser...

compare it to what is used now. Explosive flares that only burn for 30 seconds, dangerous, bulky, expiry dates quite short. Terrible archaic things but still obligatory to carry them in many places depending on type of boat. They wouldn't get to production if only thought of now. all good...

I suspect this is a dead end. You are right that its unlikely that anything will be approved, so nothing over 5mW will be made or tested. But its a shame as it seems from the links you gave there are powerful lasers that have good enough run time to make them worth carrying, sufficient duty...

yes the host is ideal for what I wanted but the power is too low.

I just double checked the legal side of this in the UK and it is clear that it is allowed with a reasonable excuse legislation.gov.uk/ukpga/2018/9/section/1 And there is no law against importing or owning any power of laser in the UK. Only misusing one. My biggest worry in all this is my...

Same as the USCG I've discounted the use of weak lasers. LEDs are better now. The type of signal I'm thinking of is a raising the alarm signal rather than showing a light for searchers type signal. Does a strong laser have the potential to do both? Yes for sure ideally I would have a...

UK That point likely explains why none are available specifically for that purpose and the one that is is limited to <5mW. However it is not illegal to signal a plane with a laser in a genuine life or death situation which is the only situation I would use it. So my situation is it is legal but...

Hi, First thanks for all the useful information that I've found on the forum already. I think I'm half way to working it out and hope you can get me the rest of the way. There has been a product called the Greatland Rescue Laser Flare around for a decade without being updated to make it more...