The Sea Marshall is the only PLB on the market which doesn't need to be placed inside a pressure-resistant container. There are other small PLBs out there, but you need to buy something like this to put them in: http://www.mcmurdo.co.uk/products/pr...5&produ ct=37 (You'd thread your tank-band through it.)
As for obsolescence - the Sea Marshall will always work providing someone is listening out for it on the right frequency. I understand that the UK coastguard will continue to support this frequency despite it being superseded by a new international distress frequency. But basically, this technology is still dependent on someone on earth picking up your PLB's radio signal, and then having the equipment to track that signal. And if you're any distance from shore and either nobody knows you're missing, or knows that you have an old PLB, why would they be out 'listening' for you?
A modern PLB with in-built GPS is a far better proposition. It uses satellite communication to say "help - come and find me at this exact location." The boats/helicopters which try to rescue you won't even need any tracking equipment - they just head for your exact coordinates, which are updated every few minutes by your PLB (and would be relayed to them by the coastguard.)
So a modern GPS PLB is the perfect panic button. So long as you can see the sky, it should work. Three examples of this type are the McMurdo Fastfind Plus, the McMurdo Max GPS, and the ACR resqfix. Have a look on ebay - some cheap ones to be had from the US.
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