Open internet browser
Go to http://rda.ucar.edu
RDA Dataset Search
Type "ICOADS" and click "search"
=> http://rda.ucar.edu/datasets/ds540.0/
International Comprehensive Ocean-Atmosphere Data Set (ICOADS) Release 2.5, Individual Observations
ds540.0
Data Access
=> http://rda.ucar.edu/datasets/ds540.0/#!access
Click "get a subset" in the row "IMMA format data for ICOADS Release 2.5"
Select temporal and spatial range using the interactive tool shown below: