What is the difference between “visible places” and places labeled on the maps themselves?
Visible places refers to the placement of red and yellow dots on maps. The dots do not themselves contain labels, although rolling over them will open a pop-up box naming the region or place the dot represents and statistics about slaves embarked and/or disembarked there in the period indicated in the time frame. Depending on zoom level, labels of broad regions, regions, or ports will appear on the background map. As a rule, one should select a zoom level that corresponds with the selection of visible places: for ports, for example, select the finest zoom level (1).
