Stuff you think someone should make but you lack the motivation to do it yourself.
I'll start. EPIRB activated inflatable life jackets. You know how if you get too far away from your car it locks itself? Why can't that be done with life jackets. If you get more than 10m away from the EPIRB (adjustable for big boats obviously) your life jacket auto-inflates. You build in a 10 second beeper so if you get out at a jetty you have ten seconds to turn around and throw your life jacket back in the boat. If you remain too far from the EPIRB it automatically goes off. Handy if you're fishing by yourself and fall overboard. So the sequence would be 1) You fall overboard bumping your head and knocking yourself out 2) Your jacket auto-inflates as you drift away from your boat 3) If you don't gat back in in less than 5mins the EPIRB goes off alerting the authorities. Someone who is more motivated than me should make this!
Now it's your turn