Whether smartphone, camera or mini quadrocopter: the USB socket as a charging power source is now a widespread standard. For use at home, most manufacturers still supply a plug-in power supply unit, which of course fits as an option. For very simple devices such as toys, the USB socket on the computer is sometimes used as a charging station.
But what if there is no socket, notebook or power bank with sufficient battery power within reach - i.e. when travelling on a boat? We analysed adapter plugs and built-in sockets that provide a USB charging socket directly from the 12 volts on board. We mainly focussed on products that you can find from ship suppliers and preferred built-in solutions to flying adapters.