Nautilus life line en route. Cheap insurance, hope I've just thrown away $250.
Just remember, a Lifeline is great in countries that all use VHF radios and do provide additional tools to ensure you are not lost, however going to many third world countries or small pacific (and I suspect other small) islands, don't have a boat radio thus the Lifeline is effectively useless in these areas. In US, Europe, OZ and other countries where the rules force dive boats to have working VHF radios Lifelines are a good backup and not a waste of money. However if you have one, before you dive, ensure that the dive boat knows you have one and that the boat has a working VHF radio (preferred with DSC which shows your position if triggered), and they know what to do if you use your Lifeline.
In the case where locals do not have VHF radio, an EPIRB in a waterproof container may be required. Even though you have an EPIRB, that's also no guarantee that the country/island has a safety system set up that will ensure emergency services start looking for you, however at least your country of licence knows you are in trouble and there is a higher possibility of someone coming and looking for you over just using hope, a whistle and a DSMB.
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