=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 11-Jun-1991
Dakar               390/001 RLR(1965) is 8.3m below Repere Fondamental
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 12-Jul-1993
Dakar               390/001 RLR(1965) is 8.3m below Repere Fondamental
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 03-Nov-2008
Following information from Guy Woppelmann the RLR diagram for Dakar was redrawn to show the relationship between benchmarks Nr.0 bis,Nr.0 and Nr.21. The UH TGZ is the same as the French Zero Hydrographique.