%0 Journal Article %A Rogowski, Jerzy B. %A Klek, Magdalena %T Determination of normal heights in the area of Polish Economic Zone %J TransNav, the International Journal on Marine Navigation and Safety of Sea Transportation %V 11 %N 4 %P 737-739 %D 2017 %U ./Article_Determination_of_normal_heights_Rogowski,44,781.html %X The article presents a method of determining the level of the seabed in the Polish reference system. The authors show how to determine the ellipsoidal height of the seabed using GNSS measurements and single-beam echo sounders. The authors propose the transition to the system of normal heights referred to the average level of the North Sea as defined by the tide-gauge in Amsterdam to be made using the EGM 2008 model and data from the official Polish quasi-geoid model as well as data from another model distributed by GUGiK (Head Office of Geodesy and Cartography). The article presents also potential errors of the presented method. %@ 2083-6473 %R 10.12716/1001.11.04.22