"History". Federal Maritime and Hydrographic Agency. Archived from the original on 9 April 2013. Retrieved 18 April 2013.
"ImpressumArchived 2015-05-10 at the Wayback Machine." Federal Maritime and Hydrographic Agency of Germany. Retrieved on April 19, 2014. "Bundesamt für Seeschifffahrt und Hydrographie (BSH) Bernhard-Nocht-Straße 78 20359 Hamburg Postfach 30 12 20 20305 Hamburg"
"Ships". Federal Maritime and Hydrographic Agency. Archived from the original on 9 April 2013. Retrieved 18 April 2013.
"Messages in Bottles". Federal Maritime and Hydrographic Agency. Archived from the original on 9 April 2013. Retrieved 18 April 2013.
"ImpressumArchived 2015-05-10 at the Wayback Machine." Federal Maritime and Hydrographic Agency of Germany. Retrieved on April 19, 2014. "Bundesamt für Seeschifffahrt und Hydrographie (BSH) Bernhard-Nocht-Straße 78 20359 Hamburg Postfach 30 12 20 20305 Hamburg"
"Ships". Federal Maritime and Hydrographic Agency. Archived from the original on 9 April 2013. Retrieved 18 April 2013.
"Messages in Bottles". Federal Maritime and Hydrographic Agency. Archived from the original on 9 April 2013. Retrieved 18 April 2013.
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Dehling, Thomas; Ellmer, Wilfried (2012). "Zwanzig Jahre Seevermessung seit der Wiedervereinigung" [Twenty Years of Bathymetry after the Reunification]. Hydrographische Nachrichten (in German) (93): 16–20. ISSN1866-9204.