The top picture is our best surface analysis map of the ITCZ (doldrums) just SW of Dakar valid at 18z. The closest ASCAT pass (hi-res from KNMI) is some hours earlier at 1030z, but this pattern does not change rapidly and our point for now is just to show the type of detail we can see. Searching around the data, we can often find cases closer in time.
The blue rectangle marks the region shown below in the ASCAT data.
Below we see the GFS model wind for 18z, which is effectively a surface analysis for this 18z run, but we do not learn much from it. In short, the scatterometer winds are the most precise wind data we can get at sea... or get at home for a particular part of the ocean.
This is the end of this example. We will add more as we run across them or share ones we actually use in routing.
Study on your own
(1) get the top picture: opc.ncep.noaa.gov/UA/Atl_Tropics.gif
(2) get the middle picture: knmi.nl/scatterometer/ascat_b_osi_co_prod/ascat_app.cgi
(3) get the bottom picture: passageweather.com/maps/arc/mappage.htm