For each Contient we've picked the Capital City having most other Capital Cities within 500 km. Find those Capital Cities and the ones within 500 km. You are given the bearing to reach them as a hint.
In Oceania no capital cities are less than 500 km away
When more than one choice was possible, the first capital city in alphabetical order was chosen; typing one of the excluded ones will make it appear, too (provided it's not one of the surrounding ones)
Note: the surrounding capitals aren't necessarily in the same continent!