TY JOUR TI IMPROVEMENT OF THE METHODS OF ENSURING SAFETY OF STORM NAVIGATION OF THE SHIPS KW storm navigation KW dangerous pitching options KW circular charts KW improvement of safe storm navigation JO Vestnik of Astrakhan State Technical University. Series: Marine engineering and technologies AU Ershov, A.. AU Terenchuk, A.. PY 2015 IS 2015 PB Astrakhan State Technical University