How many dissimilar buoyage systems were in use worldwide in 1976?

In 1976, the maritime navigation landscape was characterized by the existence of various buoyage systems utilized across different countries. The number of dissimilar buoyage systems in use at that time was 30. This highlights the diversity of navigation aids that were implemented globally, each reflecting the individual practices, standards, and regulations of various nations.

The proliferation of dissimilar buoyage systems posed challenges for international maritime navigation, as mariners could encounter different buoyage markers in various regions, leading to potential confusion and increased navigation risks. The establishment of the IALA (International Association of Lighthouse Authorities) in 1957 aimed to address these discrepancies by promoting standardization in buoyage systems, ultimately leading to a more uniform global approach to navigational aids.