A device (10) for detecting a signal of interest in order to locate an underwater source of the signal. The device includes a receiver (13) configured to detect the signal of interest, an actuator (14) configured to allow at least a portion of the detection device (10) to move towards a zone indicating a result of detection of the signal of interest in response to the receiver being operated, and an emitter (15) configured to indicate the result of detection of the signal of interest.

An exemplary aspect comprises a self contained acoustic beacon comprising: (a) an acoustic transducer; (b) an acoustic amplifier; and (c) a depth calculator. An exemplary aspect comprises a self contained acoustic beacon comprising: (a) an acoustic transducer; (b) an acoustic amplifier; (c) a water sensor; and (d) a battery life controller. An exemplary aspect comprises a self contained acoustic beacon comprising: (a) an acoustic transducer; (b) an acoustic amplifier; (c) a water sensor; and (d) a waterproof cover with at least one water-dissolvable portion, wherein the water-dissolvable portion dissolves within a pre-determined period of time, and wherein the beacon is powered on when water is detected by the water sensor.

A vessel mounted multi-directional signal assembly includes a multi-directional signal display assembly comprising a plurality of signal display panels. Each of the plurality of signal display panels comprising at least one display surface, and a plurality of signal indicia are affixed onto different ones of each of the plurality of display surfaces. A signal support assembly is provided such that the multi-directional signal display assembly is disposable into a deployed orientation about the signal support member. A vessel mount assembly is operatively interconnected to the signal support assembly and comprises a mount member to facilitate deployment of the multi-directional signal display assembly on the vessel.

A marker buoy constructed of a main shaft extending vertically when in use and including a marker flag, a floating body, and a spool mounted to the main shaft.

A method for locating drifting gear, including at least the following steps: —anchoring a submerged beacon to one of the ends of the drifting gear, the submerged beacon being equipped to rise to the surface and including a casing enclosing a transceiver of a radio-acoustic signal associated with a control unit, and a release mechanism allowing the beacon to rise in response to reception of a code and an order by the control unit, —geolocating the start point of the drifting gear, in order to allow the fisherman to delineate the region of its location by estimating the drift of his drifting gear from the start point so as to direct the search for the drifting gear in the estimated direction, —locating the drifting gear using the submerged beacon.

A method for locating drifting gear, including at least the following steps: —anchoring a submerged beacon to one of the ends of the drifting gear, the submerged beacon being equipped to rise to the surface and including a casing enclosing a transceiver of a radio-acoustic signal associated with a control unit, and a release mechanism allowing the beacon to rise in response to reception of a code and an order by the control unit, —geolocating the start point of the drifting gear, in order to allow the fisherman to delineate the region of its location by estimating the drift of his drifting gear from the start point so as to direct the search for the drifting gear in the estimated direction, —locating the drifting gear using the submerged beacon.

A self-righting sailing vessel is described. The self-righting sailing vessel may determine the occurrence of several predetermined events, such as the self-righting sailing vessel capsizing, present or imminent inclement weather, and/or a present or imminent vessel or large marine animal. Upon detection of one of these events, the self-righting sailing vessel causes at least it's hull to become partially or completely submerged beneath the water. The self-righting sailing vessel is configured such that its rig is more buoyant than the rest of the vessel when the vessel is completely submerged beneath the water, causing the vessel to move towards an upright position while underwater. When the vessel is pointing towards an upright position, the vessel may begin ascending until it surfaces and is ready to continue sailing on top of the water.

A technique for managing an attachment between first and second portions of a device. The technique includes a retaining component having a first state in which the retaining component maintains the attachment between the first and second portions by virtue of a rigid characteristic and a second state in which the retaining component loses the rigid characteristic and no longer maintains the attachment. The retaining component transitions from the first state to the second state upon exposure to liquid water.

According to an embodiment, a fishing tool loss monitoring system comprises at least one buoy providing sensing information and buoy identification information and buoy position information, a fishing vessel terminal device providing fishing vessel information including fishing vessel identification information, fishing vessel position information, the fishing tool identification information, and the buoy position information, and a land control center performing transmitting/receiving information to/from the fishing vessel terminal device or the buoy through a communication network to gather the sensing information including underwater temperature information and overwater temperature information from the buoy during a preset time, measuring a speed of the buoy using the buoy position information when a difference between respective averages of the underwater temperature information and the overwater temperature information falls outside a preset error range.

A torpedo recovery system is provided with a hull and a float conformable on a host vehicle and lifting wire coiled on a spool attached by an extension spring as well as with an anchor to the float. An oval hole penetrates the recovery system hull at positions lined with a watertight sleeve. The spool can accommodate a locking pin. The extension spring allows compliance for take-up of the spool by having the locking pin mate with an aperture and adds a wire pre-tension. Upon vehicle shutdown; the locking pin is retracted to free the spool from a rotational constraint. The float buoyancy translates into pulling the wire from the spool with the float and extension spring continuing to the water surface. Once the float reaches the surface; the float provides a visual location for the host vehicle. The float is retrieved and a winch can recover the lightweight torpedo.