Gauges in eastern Germany (Wismar, Warnemunde, Sassnitz, Koserow) as of March 1992 are type 'Steremat', vertical drum, swimmer principle measures 1:10, continuos registration on paper chart information from L. Ballani, Potsdam.
Documentation added 1994-08-02
These values are of Wismar MSL relative to the HN datum as computed by the University of Dresden. See the report "Die Reduktion historischer Wasserstandsmessungen an der Kueste Mecklenburg-Vorpommerns auf das Hoehensystem HN76" by G.Liebsch, R.Dietrich, L.Ballani and G.Langer.
Documentation added 1994-09-29
Prior to 1894 readings from tide pole. 1894 analogue gauge installed. 1945-52 tide pole while new gauge installed. Dresden analyses based on: 1848-1882 1 reading per day, corrected for tidal effects 1883-1894(June) 4 readings per day, corrected for tidal effects 1894(July)-1945 4 readings per day from charts 1946-1952 1 to 4 readings per day, corrected for tidal effects 1953-1980 4 readings per day So, tidal aliasing effects should be largely removed from Desden values
Documentation added 2002-01-23
Wismar data up to 1992 supplied by Technische Universitat Dresden (auth=H3). Data 1993- supplied by Bundesamt fur Seeschiffahrt und Hydrographie (BSH), Hamburg (auth=16).
Documentation added 2010-08-09
The data for Wismar was measured to Normal Null which is a German datum related to Potsdam near Berlin. It is similar to ODN in the UK or NAP in Holland. It is unusual therefore to relate the data to RLR as it 'breaks the rules' of RLR. Data now refers to TGZ.
Bundesamt fur Seeschifffahrt und Hydrographie Hamburg Bernhard-Nocht-Strasse 78 20359 Hamburg