English language map. Ice warnings on 14 April 1912, in the course of the Titanic. According to: Samuel Halpern: Account of the Ship's Journey accross the Atlantic. In: Samuel Halpern (ed.): Report into the Loss of the SS Titanic: A Centennial Reappraisal. The History Press, Stroud 2016 (2012), pp. 71–89, see pp. 81/82.
Own work
Ziko van Dijk