Type into either field — the other one converts instantly.
One nautical mile is exactly 1.852 km — the length of one minute of latitude, which is why charts and sailors measure distance in it.
Type into any field — the other two convert instantly.
A knot is one nautical mile per hour, i.e. exactly 1.852 km/h. Croatian forecasts (meteo.hr) publish wind in m/s, while charts and boat instruments read in knots — a handy rule of thumb is 1 m/s ≈ 2 knots.