Each dot represents a world capital. Choose a capital and type its name followed by one of 8 bearings (NN, NE, EE, SE, SS, SW, WW, NW). This will highlight:
1) the capital you typed 2) any capital within 3000 km and within 45° of the chosen bearing 3) any capital within 1500 km and within 90° of the chosen bearing 4) any capital within 300 km
eg typing VictoriaNN will get you: 1) Victoria 2) Asmara (2,861 km 320°), Djibouti (2,250 km 322°), Sana'a (2,532 km 330°) 3) Mogadishu (1,343 km 303°)