Boat manuals need to include electrical schematics and software details Good drawings take time to make. Time costs money. Therefore, good drawings are not cheap. Some boat builders seem to think that this logic leads to a fourth point: "Therefore, we will not include drawings." Er, guys? Not cool. Seriously, not cool. Just see what happens the very first time the owner has to have something fixed, and the technician spends most of a day rooting around in the bilges trying to figure out where the hell all the wires are going.