Look for a solar powered anemometer that could be mounted on a channel marker in a large freshwater lake. The Ecowitt WS68 or WS80 look interesting, but I can figure out if those could be paired to their 3G/4G gateway by themselves or if they needed some other unit.
Also, are those units limited to 10 min update times? Looking for something that could report more frequently than that during certain hours of the day, or on demand. Use case is monitoring winds for sailing.