The specific installation position, lighting angle and the brightness for the navigation light, all have special requirements. The irregular use or failure of the navigation light will transmit the error signal and caused huge obstacles for the collision prevention.

Masthead light

It is installed above on the mast of a ship or above on the centerline, showing uninterrupted in the 225 degree horizontal arc.

Sidelight

It is installed on the left and right sides of the highest boat deck. The screen of sidelight facing the light surface should be coated with the berlin black. The height of the screen is at least equal to the height of the lamp. The boat which has a length of more than 80 meters, should install red, green sidelight on the bow, stern.

Stern light

The boat stern light should be installed in the middle of the stern. The height of the light should be kept horizontally with the sidelight as possible, but can’t be higher than the height of the sidelight.

Headlight

The marine headlight is placed in the bow of the pusher barge and the height can’t be higher than the headlight.

Red-green flashing light

It is the left red, right green marine flash lighting installed above the sidelight and its flashing frequency is 50 to 70 per minute. The boats with a length of less than 12 meters can also adopt a water torch instead of red and green flashing lights and should keep light bright with clear color.

Anchor light

The marine anchor light is installed on the top of the mast with all-around flashing.

Each provision concerning the navigation light must be observed from sunset to sunrise. The signal lights can also be displayed in the situation that the visibility is poor during the day. At the time of navigation light displaying, the lighting which confuses or weakens the display performance of the signal light, can’t be allowed to display.

The Function Requirements

1. The navigation light should be waterproof and the lamp holder should have a structure that prevents its own loose. It should adopt a two-filament bulb. The control box should be in the cab and the switch of the control box should have an instruction to explain its use. The cable of the navigation light is fastened with the complete lampshade & bulb and the good & reliable ground.

2. The switch should be set on the navigation light control box, used to convert the power supply. Each navigation light should be powered by a separate branch that is placed close to the control box installed in the cab and should adopt the switch and fuse which are installed in the control box for control and protection of each insulation of these branches.

3.The navigation light control box should be powered directly from the main distribution board and emergency distribution board.

4. There should be an automatic indicator that can make an auditory or a visual alarm signal at each navigation light and there should be some measurements which are adopted to prevent the navigation light go out due to the signal light failure. The auditory and visual alarms for the failure of the navigation light control box should be provided.
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