Wall-Mounted 12-Volt Power Supply with Replaceable 18-Volt Batteries A compact, wall-mounted PowerBox was developed to provide a reliable 12-volt power supply on a sailing boat. Instead of using a conventional 12-volt lead-acid battery, the system is powered by replaceable batteries from the Bosch 18V tool battery platform. The PowerBox supplies the navigation instruments, mast-mounted displays, masthead light, and dimmable LED lighting inside the boat. An additional 12-volt

A custom sunshade was developed for a sailboat using tent poles, 3D-printed connectors, and carabiners for attachment. The structure can be set up in less than four minutes, is compact to store, and provides significantly more usable shade than a conventional cover stretched over the boom. With total costs of around €120, the result is a stable and individually designed alternative to professionally manufactured sunshades, which often cost more than €800. Initial Situation As

I am currently preparing for the UBI (VHF Certificate for Inland Navigation) and was looking for a simple, efficient way to learn the standardized question catalogs.The official questionnaires are extensive, repetitive, and not very motivating to study in their original form. I wanted a solution that allows structured learning, repetition, and measurable progress. After searching online, I collected the official question catalogs and converted them into CSV files .These file