knot, nautical mile
浬 centers on a unit of distance at sea: a nautical mile, or the speed of one nautical mile per hour (a knot).
浬 is a modern Japanese coinage combining 氵 (water) with 里 (ri, a traditional Japanese league) to represent a nautical mile. The character was created specifically for maritime distance.
Water 氵 plus the distance unit 里: a nautical mile is a water-based league.
For リ, picture a sailor measuring distance at sea with a league (里, リ) marked on a nautical chart: 里 -> リ, and the water radical confirms it's a nautical mile.