The present invention includes systems and methods for a continuous-wave (CW) radar system for detecting, geolocating, identifying, discriminating between, and mapping ferrous and non-ferrous metals in brackish and saltwater environments. The CW radar system generates multiple extremely low frequency (ELF) electromagnetic waves simultaneously and uses said waves to detect, locate, and classify objects of interest. These objects include all types of ferrous and non-ferrous metals, as well as changing material boundary layers (e.g., soil to water, sand to mud, rock to organic materials, water to air, etc.). The CW radar system is operable to detect objects of interest in near real time.

The present invention includes systems and methods for a continuous-wave (CW) radar system for detecting, geolocating, identifying, discriminating between, and mapping ferrous and non-ferrous metals in brackish and saltwater environments. The CW radar system generates multiple extremely low frequency (ELF) electromagnetic waves simultaneously and uses said waves to detect, locate, and classify objects of interest. These objects include all types of ferrous and non-ferrous metals, as well as changing material boundary layers (e.g., soil to water, sand to mud, rock to organic materials, water to air, etc.). The CW radar system is operable to detect objects of interest in near real time.

A kit is for towing through water by a swimmer to transport items, which comprises: an inflatable flotation device and a dry bag (32). The flotation device comprises, when inflated, a lead portion (10a), two spaced side portions (10b, 10c) each extending rearwardly from the lead portion, and attachment means. The dry bag (32), which may be separate to the flotation device, has an openable, water-tight closure. The side portions, when the device is inflated, and the dry bag are respectively shaped to cooperate so that the side portions provide support for the dry bag. The flotation device including the attachment means is arranged to attach the dry bag to the flotation device such that the closure (34) is located above a lead portion of the flotation device. The kit is attachable to a tow leash (32) such that a swimmer can tow the flotation device with the dry bag attached in water and such that the lead portion leads through the water.

A kit is for towing through water by a swimmer to transport items, which comprises: an inflatable flotation device and a dry bag (32). The flotation device comprises, when inflated, a lead portion (10a), two spaced side portions (10b, 10c) each extending rearwardly from the lead portion, and attachment means. The dry bag (32), which may be separate to the flotation device, has an openable, water-tight closure. The side portions, when the device is inflated, and the dry bag are respectively shaped to cooperate so that the side portions provide support for the dry bag. The flotation device including the attachment means is arranged to attach the dry bag to the flotation device such that the closure (34) is located above a lead portion of the flotation device. The kit is attachable to a tow leash (32) such that a swimmer can tow the flotation device with the dry bag attached in water and such that the lead portion leads through the water.

A watercraft comprises a motor, an inertial mass, and a fin. The motor oscillates the inertial mass about an axis, producing a torque reaction on and oscillation of the motor. Oscillation of the motor is communicated to the fin, producing thrust. The system can be operated in reverse, to generate electric power when the system is in a flowing stream of thrust fluid.

A watercraft comprises a motor, an inertial mass, and a fin. The motor oscillates the inertial mass about an axis, producing a torque reaction on and oscillation of the motor. Oscillation of the motor is communicated to the fin, producing thrust. The system can be operated in reverse, to generate electric power when the system is in a flowing stream of thrust fluid.

An apparatus that is configured to connect a first boat to second boat or to an object, such as a dock, in a manner that prevents the surface of the first boat from contacting the surface of the second boat or the object. The apparatus comprises a connecting assembly having a first engaging mechanism at its first end and a second engaging mechanism at its second end. The connecting assembly comprises a pair of connecting members that are telescopically configured and a length adjusting mechanism that adjusts the length of the connecting assembly and the spacing provided by the apparatus. The length adjusting mechanism can include a locking mechanism that locks the connecting members or a biasing mechanism that biases the two members apart. The engaging members can be suction cups that have cup locking mechanisms that allow the user to lock the suction cups to a surface.

An apparatus that is configured to connect a first boat to second boat or to an object, such as a dock, in a manner that prevents the surface of the first boat from contacting the surface of the second boat or the object. The apparatus comprises a connecting assembly having a first engaging mechanism at its first end and a second engaging mechanism at its second end. The connecting assembly comprises a pair of connecting members that are telescopically configured and a length adjusting mechanism that adjusts the length of the connecting assembly and the spacing provided by the apparatus. The length adjusting mechanism can include a locking mechanism that locks the connecting members or a biasing mechanism that biases the two members apart. The engaging members can be suction cups that have cup locking mechanisms that allow the user to lock the suction cups to a surface.

The present invention includes systems and methods for a continuous-wave (CW) radar system for detecting, geolocating, identifying, discriminating between, and mapping ferrous and non-ferrous metals in brackish and saltwater environments. The radar system (e.g., the CW radar system) generates multiple extremely low frequency (ELF) electromagnetic waves simultaneously and uses said waves to detect, locate, and classify objects of interest. These objects include all types of ferrous and non-ferrous metals, as well as changing material boundary layers (e.g., soil to water, sand to mud, rock to organic materials, water to air, etc.). The radar system (e.g., the CW radar system) is operable to detect objects of interest in near real time.

The present invention includes systems and methods for a continuous-wave (CW) radar system for detecting, geolocating, identifying, discriminating between, and mapping ferrous and non-ferrous metals in brackish and saltwater environments. The radar system (e.g., the CW radar system) generates multiple extremely low frequency (ELF) electromagnetic waves simultaneously and uses said waves to detect, locate, and classify objects of interest. These objects include all types of ferrous and non-ferrous metals, as well as changing material boundary layers (e.g., soil to water, sand to mud, rock to organic materials, water to air, etc.). The radar system (e.g., the CW radar system) is operable to detect objects of interest in near real time.