The existence of small crafts hardly stands out at night since the height of their navigation lights is lower and their luminance is weaker than those of large vessels. That affects ship collision accidents concerning with small crafts. In this paper, making their existence stand out by exhibiting LED tape lights (also called LED strip lights or LED ribbon lights) has been proposed. Through some experiments, it has been verified that small crafts exhibiting the LED tape lights have the following advantages. (1) Their existence is easily recognized by other vessels. (2) The course of them cruising at night is correctly judged by other vessels. It has been also confirmed that the LED tape lights cannot be mistaken for the navigation lights specified in the rules and do not impair their visibility and distinctive character, and interfere with the keeping of a proper look-out. In addition, LED tape lights in blue color have been proposed to exhibit because of the contrast to the navigation lights and to the background of city lights.
