About a year ago one sailor showed his fancy life jacket. It included EPIRB or also known as personal beacon.
To date, the smallest personal beacon I managed to find is Fastnet 220, which weights 150 grams and has battery life of 6 years.
Given the scale of airline industry, how much would it cost in installation, maintenance and fuel, to fit each passenger life jacket with such device, excluding the device cost itself?
Edit: Total weight per 200 seat airplane is 30kg. Perhaps someone can translate to fuel/$ per year per whole industry?
From Thomas Cook PDF, I found that life jackets are audited every 12 weeks and takes up to 40 man-hours per aircraft although they've implemented RFID tags now.
Regarding points outside the original question scope:
The device cost can also decrease to few dollars if they are manufactured in mass scale.
Certification is also a factor. Feel free to estimate it as well if you are familiar with the industry.