A calling system for a personal watercraft includes processing circuitry. The processing circuitry is configured to: obtain a specific state signal indicating that the personal watercraft is in a given specific state; and wirelessly transmit a calling signal based on the specific state signal.

Provided is a technique that facilitates control of a navigation light which uses light-emitting diodes for a light source. This navigation light control system is provided with: a navigation light that has a light source for which a light-emitting diode is used; a power supply unit that supplies power to the navigation light; and a control device that controls lighting of the navigation light, wherein the control device is provided with a light source circuit that supplies the power received from the power supply unit to the light source, and a determination unit that determines failure of the light source on the basis of the value of the current flowing through a resistor connected to the light source circuit.

A system for securing a submerged buoy including a signalling element floating on the surface and connected to the buoy by a link, said securing system being wherein it includes a reversible coupling device comprising an attachment member secured to the end of the link opposite the signalling element, a complementary attachment member rigidly connected to the buoy and capable of engaging with said attachment member in order to allow the link to be secured to or released from the buoy, a pressure sensor, a control unit associated with a time measurement unit, said control unit ordering said complementary attachment member to separate from said attachment member when a pressure variation, measured by associating said pressure sensor and said time-measurement unit, is higher than a set value.

A system for securing a submerged buoy including a signalling element floating on the surface and connected to the buoy by a link, said securing system being wherein it includes a reversible coupling device comprising an attachment member secured to the end of the link opposite the signalling element, a complementary attachment member rigidly connected to the buoy and capable of engaging with said attachment member in order to allow the link to be secured to or released from the buoy, a pressure sensor, a control unit associated with a time measurement unit, said control unit ordering said complementary attachment member to separate from said attachment member when a pressure variation, measured by associating said pressure sensor and said time-measurement unit, is higher than a set value.

A navigation method for a ship which includes: a plurality of main generators that feed power to navigation equipment used in normal navigation and appliances for the living quarters provided within a ship body; and an emergency generator that feeds power to emergency equipment in case of fire or flood. The navigation method includes: an emergency power feeding step for feeding power to the emergency equipment using the emergency generator when at least one of the plurality of main generators is disabled due to fire or flood; and a return-to-port power feeding step for feeding power to return-to-port equipment, required for navigation for returning to port, using the main generators and the emergency generator after the fire or flood has subsided.

An audio system in a marine vessel may be created or enhanced using existing parts of the marine vessel. One or more audio transducers may be secured directly to the windshield, and once connected with an audio input, the windshield acts as a transparent speaker.

An audio system in a marine vessel may be created or enhanced using existing parts of the marine vessel. One or more audio transducers may be secured directly to the windshield, and once connected with an audio input, the windshield acts as a transparent speaker.

Provided is a technique that facilitates control of a navigation light which uses light-emitting diodes for a light source. This navigation light control system is provided with: a navigation light that has a light source for which a light-emitting diode is used; a power supply unit that supplies power to the navigation light; and a control device that controls lighting of the navigation light, wherein the control device is provided with a light source circuit that supplies the power received from the power supply unit to the light source, and a determination unit that determines failure of the light source on the basis of the value of the current flowing through a resistor connected to the light source circuit.

The invention relates to an integrated illumination and signalling system for navigation purposes integrating a front illumination assembly for the prow, a rear sternlight assembly, an upper anchor light assembly, an illumination assembly at the base of the transparent mast, a signalling assembly also arranged at the rear for illuminating the stern of the vessel, starboard and port side signalling light assemblies pre-arranged in a central longitudinal portion of the vessel, from the center to the rear, preferably on the top frame or a cover of the vessel. The invention also relates to a method for integrating illumination and signalling for nagivation purposes, consisting in a support device combining illumination and signalling and a device integrating illumination and signalling for navigation purposes, comprising a sole plate attached to the vessel, on the top frame, a column or suitable support, with a two-part hull providing an inner support for attaching a radar deflection device(es) a support element for the flag mast and suitably arranged lights and signals on the outside, according to international navigation standards; the hull (1), the fixed sole plate (2), the rear cover (5), the combined support (7), the rod (10), the reflectors (602, 803, 14 and 1401) and the lenses (601, 804, 1402 and 1403) being preferably made of a polymer material protected against UV (ultra-violet) radiation.

The invention relates to an integrated illumination and signalling system for navigation purposes integrating a front illumination assembly for the prow, a rear sternlight assembly, an upper anchor light assembly, an illumination assembly at the base of the transparent mast, a signalling assembly also arranged at the rear for illuminating the stern of the vessel, starboard and port side signalling light assemblies pre-arranged in a central longitudinal portion of the vessel, from the center to the rear, preferably on the top frame or a cover of the vessel. The invention also relates to a method for integrating illumination and signalling for nagivation purposes, consisting in a support device combining illumination and signalling and a device integrating illumination and signalling for navigation purposes, comprising a sole plate attached to the vessel, on the top frame, a column or suitable support, with a two-part hull providing an inner support for attaching a radar deflection device(es) a support element for the flag mast and suitably arranged lights and signals on the outside, according to international navigation standards; the hull (1), the fixed sole plate (2), the rear cover (5), the combined support (7), the rod (10), the reflectors (602, 803, 14 and 1401) and the lenses (601, 804, 1402 and 1403) being preferably made of a polymer material protected against UV (ultra-violet) radiation.