The SediLink™ radio modem is intended to be mounted on a buoy and connected by cable to a SediMeter™ underneath. The solar cells keep the modem and the SediMeter™ charged, and a blinking white LED in each cardinal direction alerts seafarers at night. An XBee radio provides license-free radio communication. There are different frequency and range options available, and many of them also offer meshing. This means that the radios forward traffic, so that the total distance from base station to the farthest radio can be much larger than the range. This allows a dredging operator to monitor siltation, turbidity, or even erosion from the work area in real time.