High resolution time/space underway data can readily be available by the participation of a private domestic liner vessel servicing the coastal seas in the voluntary observations. The results of the measurements are summarized in temperature, salinity and pH variation, taken in the coastal areas susceptible to large environmental change. The coastal-going vessels can provide in-situ data with less delayed mode by using the mobile communication infrastructure, and we will continue to promote that more private coastal vessels can take part in the voluntary observation ship program.