A sextant is a device used to determine a ship's latitude by measuring the angle between the horizon and the celestial body, typically the sun or a star. This information is then used in conjunction with nautical charts to calculate the ship's position on the Earth's surface.
its called a sonogram
Ships are steered by a device called a rudder, which is operated from the helm.
Different kinds of radar are
ships
prism
Sextant
The Compass-
Resource
Archimedes invented a device to set fire to ships. This used mirrors to focus the rays of the sun on the ships which were attacking the city.
The clock has been used to tell time on ships for centuries.
To determine wind speed by whatever device is used.