=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 11-Jun-1991
Tarifa              220/021 RLR(1951) is 9.3m below BM
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 17-Nov-1998
All data on file replaced with values received for 1943-89, 1991-97 from the IEO. RLR revised using 1997 information Gauge type:1943-89  mechanical float. Gauge type 1991- mechanical float with digital output
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 22-Mar-1999
Data for 1997 revised and RLR was re-calculated using 1997 as the RLR year. For 1991 data onwards RLR factor is 5.900m.
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 11-Dec-2008
Database updated with revised dataset supplied by Maria Jesus. Previous values copied and stored in the file.
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 19-Jan-2012
Following receipt of the revised data the RLR data looks to be in error. Whereas previously the dataset had three different RLR factors it now looka as if only one should be applied to the whole dataset. As the precise datum for the revised data is unknown the RLR values have been supressed until we can clarify the situation with IEO.
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 09-Jul-2013
From information from IEO the primary benchmark is now CRUZ 3.30m above TGZ. RLR factor is 5.9m for the whole dataset.
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 03-Sep-2014
Using values from a listing recently supplied by the IEO the co-ordinates for Tarifa have been revised.