This interactive map viewer allows users to visualize and download in-situ oceanographic or atmospheric data from a Dapper OpenDap server. The map can be zoomed or dragged, with an in-situ station layer that allows selection of data stations, and a plot window that allows users to plot data from one or more stations. Datasets (temperature, salinity, current, chemistry) include realtime global Argo data, Tropical Atmosphere Ocean (TAO) Project El Nino buoy data, time series data from the National Data Buoy Center, Global Summary of the Day data, and other collections of oceanographic hydrographic and time series data. Educational levels: High school, Undergraduate lower division, Undergraduate upper division, Graduate or professional