1. In the case of small Entities (especially islands) given are coordinates with accuracy to geographical minutes. Towards divergences in numerous sources too reliable are recognized data from The CIA Factbook, government - pages and from U.S.A. National Geospatial-Intelligence Agency.
2. In the case of large Entities, are given approximate coordinates (to 1°) of the point lying in the geometrical middle of the Entity.
Note: it is proper to pay attention that the 1 geographical minute it is about 1852 meters and the 1 geographical second it is about 31 meters. So to publish of coordinates with the exactitude to geographical seconds has a not large meaning – only in the case of very small objects. Simultaneously appears the doubt regarding the reliability of so exact measurement (its sources); especially when this are not GPS' coordinates.