During the two surveys with R/V Odin Finder and R/V Urania we collected data with the WGS84 datum. SHOD of the Turkish Navy, in contrast, collected their data with the ED50 datum. Tab. 9 shows the seven parameters for the Helmert's datum shift from ED50 to WGS84.
This datum shift was applied to the coastline data provided by SHOD in the Izmit area, and will be used for the integration of the bathymetric data sets with SHOD or other available data.
All the maps produced for the Izmit Area, that can be seen further on in Appendix have the ED50 coastline data (provided by TÜBITAK and SHODB) transformed to WGS84 and plotted. As and example we can show the data collected in the eastern tip of the Izmit Gulf just facing Golcuk. Fig. 59 have the present cruise Multibeam data and the contours from the SHODB multibeam data collected just after the Kocaeli earthquake of 2001-08-17.