$1 \text{ nautical mile per hour (knot)} \approx 0.514 \text{ m/s}$

$1 \text{ m/s} = 3.6 \text{ km/h}$

$1 \text{ ft/s} = 0.3048 \text{ m/s}$

$1 \text{ mph} \approx 0.447 \text{ m/s}$