Transducers are electrical sensor devices that are used to measure depth. Some also come with Temperature sensors to measure the temperature of the water, information which can prove invaluable.
The knot (/nɒt/) is a unit of speed equal to one nautical mile per hour, exactly 1.852 km/h (approximately 1.151 mph or 0.514 m/s). … The knot is a non-SI unit. The knot is used in meteorology, and in maritime and air navigation.
