A position reference sensor (100) has a light source (120), a detector (160) and a processor (170). The light source (120) is configured to emit light having a first component and a second component. The detector (160) is configured to detect reflected light. The processor (170) is configured to determine a distance between the position reference sensor (100) and a target based on the emitted light and the detected reflected light. The processor (170) is also configured to determine that the target is a selective retroreflector (140) based on the intensity of the first component of the light in the detected reflected light and the intensity of the second component of the light in the detected reflected light.

The present invention relates to a method for acquiring an object information, the method comprising: obtaining an input image acquired by capturing a sea; obtaining a noise level of the input image; when the noise level indicates a noise lower than a predetermined level, acquiring an object information related to an obstacle included in the input image from the input image by using a first artificial neural network, and when the noise level indicates a noise higher than the predetermined level, obtaining a noise-reduced image of which the environmental noise is reduced from the input image by using a second artificial neural network, and acquiring an object information related to an obstacle included in the sea from the noise-reduced image by using the first artificial neural network.

The protective cover as described will protect the outer surface of a vessel from debris that may strike the vessel either in the water or during sporting events such as fishing. Any damage to a boat is typically expensive and time consuming and is generally to be avoided by the boat owner.

The protective cover as described will protect the outer surface of a vessel from debris that may strike the vessel either in the water or during sporting events such as fishing. Any damage to a boat is typically expensive and time consuming and is generally to be avoided by the boat owner.

According to an example aspect of the present invention, there is provided a manoeuvring system comprising at least one unit comprising a channel having a longitudinal axis and comprising at least one water intake opening, at least one water nozzle arranged within the channel and configured to guide a water flow through the at least one water intake opening at an angle relative to the longitudinal axis and in a plane perpendicular or substantially perpendicular to the Earth's normal, at least one piping connected to the channel at a first end and connected to the at least one water nozzle at a second end, and at least one pump arranged between the first end and the second end and configured to control a water flow through the at least one water nozzle.

According to an example aspect of the present invention, there is provided a manoeuvring system comprising at least one unit comprising a channel having a longitudinal axis and comprising at least one water intake opening, at least one water nozzle arranged within the channel and configured to guide a water flow through the at least one water intake opening at an angle relative to the longitudinal axis and in a plane perpendicular or substantially perpendicular to the Earth's normal, at least one piping connected to the channel at a first end and connected to the at least one water nozzle at a second end, and at least one pump arranged between the first end and the second end and configured to control a water flow through the at least one water nozzle.

A periphery recognition support system for a personal watercraft includes processing circuitry. The processing circuitry is configured to: receive position related data related to a positional relation between a personal watercraft and a peripheral object around the personal watercraft; determine based on the position related data whether or not a predetermined warning condition is satisfied; and output a predetermined warning signal when it is determined that the warning condition is satisfied.

A periphery recognition support system for a personal watercraft includes processing circuitry. The processing circuitry is configured to: receive position related data related to a positional relation between a personal watercraft and a peripheral object around the personal watercraft; determine based on the position related data whether or not a predetermined warning condition is satisfied; and output a predetermined warning signal when it is determined that the warning condition is satisfied.

A camera mounted on a seafaring vessel obtains an image showing an object. The distance to the object is computed using, in part, a normal vector of the plane containing the camera and the horizon.

A camera mounted on a seafaring vessel obtains an image showing an object. The distance to the object is computed using, in part, a normal vector of the plane containing the camera and the horizon.