ui/src/main/java/ucar/nc2/ui/geoloc/NavigatedPanel.java
public void setProjectionImpl( ProjectionImpl p) {
      // transfer selection region to new coord system
    if (geoSelection != null)  {
      LatLonRect geoLL = project.projToLatLonBB(geoSelection);
      setGeoSelection( p.latLonToProjBB( geoLL));
    }

      // switch projections
    project = p;
    navigate.setMapArea(project.getDefaultMapArea());
    if (Debug.isSet("projection/set") || debugNewProjection)
      System.out.println("projection/set NP="+ project);

      // transfer reference point to new coord system
    if (hasReference)  {
      refWorld.setLocation(project.latLonToProj( refLatLon));
    }

  }
public void setProjectionImpl( ProjectionImpl p) {
      // transfer selection region to new coord system
    if (geoSelection != null)  {
      LatLonRect geoLL = project.projToLatLonBB(geoSelection);
      setGeoSelection( p.latLonToProjBB( geoLL));
    }

      // switch projections
    project = p;
    navigate.setMapArea(project.getDefaultMapArea());
    if (Debug.isSet("projection/set") || debugNewProjection)
      System.out.println("projection/set NP="+ project);

      // transfer reference point to new coord system
    if (hasReference)  {
      refWorld.setLocation(project.latLonToProj( refLatLon));
    }

  }
Set the Projection, change the Map Area to the projection's default.