. Start GeoMapApp. Under the Basemaps tab select Global Grids, then select Seafloor Bedrock Age (Muller 2008 v3). The Seafoor Bedrock Age grid will load and a Contributed Grids window will appear. Sometimes the Contributed Grids window will be ‘parked’ in your Windows taskbar. If that’s the case, simply open it from there.
2. In the GeoMapApp window, turn on the Zoom tool and zoom in to the South Atlantic seafloor as shown in the image below: