=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 11-Jun-1991
Tromso              040/031 RLR(1964) is 12.8m below BM "Trafokiosk"
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 30-Mar-1995
Prior to 1978 fcode=C
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 30-Mar-1995
Tide gauge network modernised, new equipment installed in 1986
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 19-Jul-2010
The Norwegian Mapping Authority has revised their datasets. The Primary benchmark for Tromso is now O6 N21 11.249m above TGZ. RLR for the dataset was re-calculated using 2008 as the RLR year. The revised RLR factor is now 5.551m while RLR (2008) is 16.8m below TGBM O6 N21.
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 05-Sep-2012
For information on sea level change along the Norwegian coast see paper "Contributions to sea level variability along the Norwegian coast for 1960-2010" by K. Richter, J.E.O. Nilsen and H. Drange.
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 22-Mar-2023
Between July 1961 and May 1986 the stations was situated north of the Tromsø bridge in Hansfjordnesbukta. The tidal amplitude north of the bridge is about 7% higher than south of the bridge, where the tide gauge has been located for the rest of the record, although in several different locations. It is not known whether these higher tidal amplitudes will influence monthly or annual means.

