Permanent Service for Mean Sea Level (PSMSL)
Permanent Service for Mean Sea Level is the global data bank for long-term sea level change information from tide gauges and bottom pressure recorders [http://www.psmsl.org/]. Detailed information is given about sea level measurement, as in the IOC Manuals and Guides No. 14. In Volume I [http://www.psmsl.org/train_and_info/training/manuals/ioc_14i.pdf], guidelines are given for measurement, as well as checking procedures. Volume 1, as well as Volumes II-IV, are available for free download at the given webpage.