To thwart collisions among ocean faring vessels, the mounting of strategically located navigation lights as a warning. By a mere glance at the lights on an approaching craft, a sailor will be able to tell the type and line of motion of the oncoming vessel. In some states the conventional red, green and white lights are used in conjunction with underwater boat lights.

On crowded waters, a boat may install a flashing yellow beacon to create more awareness. These navigation aids are simply colored sources of light energy strong enough to be viewed across considerable distances. Red lights are located on the port side while green sources are on the starboard side. Depending on the orientation of two vessels with respect to each other, the operators will be able to determine who has the right of way long before they meet.

The side identified by a red light is also chosen as the main work post for the skipper. The control room has a contraption of communication equipment and levers for controlling motion of the craft. Over the years, many sailors also adopted the habit of hoisting flags or pennants on the starboard yard for easier identification.

The port, identified by a green light might have been so named from the practice of mooring a boat on the left side. This was necessary to avoid damaging the right sided oar by scraping against obstacles at the port. The waters are likely to be occupied by vessels of differing size and design with their paths crossing at some point.

Thus a small boat may be positioned such that its captain sees the green light of a large cargo liner. According to some well thought out rules, the former may be required to give way owing to the possibility of a constraining draft that limits the ship to its current line of motion. Moreover, large vessels may be restricted in ability to rapidly change their path on water.

It is likely that a one boat may technically take longer to change its course and will thus be considered to have the right of way. The argument that a green light means proceed is thus challenged when some facts are put into consideration. Any successful skipper will know that experience and an updated knowledge on prevailing marine rules could mean the difference between a safe voyage and a grisly accident.

All skippers understand that boating involves an element of risk at all times. This risk could potentially develop into danger or real peril if not properly managed. One of the worst accidents is a progression of events that unexpectedly leaves the crew in the water. Basic training should be given to all crew so that they fully understand bodily response to sudden immersion to increase their chances of survival.

Skippers are held fully responsible by law for the safety of all persons present on the ship. Whenever the crew is preparing for a voyage, the skipper must ascertain that all necessary equipment is on board. Another primary check is the motors, equipment and electrics such as underwater boat lights to ensure they are in acceptable working condition.