4 links have been added on this idea.
  1. I am pasting part of an answer from Quora here for those who don’t get it…

    Does the life jacket need to know where it is?

    Suppose it gets its position from GPS.

    Then what?

  2. No real need to have it built into the jacket, everyone should have a GPS beacon attached to them anyways.

  3. A beacon, mirror, whistle and stobe light would be more useful. Why do you want to know where you are while stuck in a big ocean?

  4. They are such a great idea. I can’t imagine going out without GPS. Floating around until you die isn’t a nice prospect, Yay for GPS.