The invention involves one or more radio markers (1) being located on or buried in the seabed with a suitable tool at a location where a geographical point requires to be retrieved. Radio markers may be deployed, for example, by means of a subsea vehicle (2). The subsea vehicle (2) is equipped with a positioning system and gyro (6) when the radio markers (1) are deployed, thereby enabling the approximate position of each individual radio marker (1) to be recorded with global map position. A subsea vehicle equipped with a radio antenna detects radio markers after returning to the approximate position by means of the coordinates.