In order to display true wind relative to water, you will need a WSO100, a DST100, and a display capable of computing true wind relative to water. The WSO100 measures the apparent wind while the DST100 provides Speed Through Water (STW) and the display computes and shows true wind relative to water. Maretron's DSM200 or DSM250 dedicated NMEA 2000 displays or Maretron's N2KView PC software are capable of computing and displaying true wind relative to water.