DESCRIZIONE
The method comprises the steps of measuring (110, 130, 140, 150) characteristics of the water and/or the air surrounding an at least partially submerged system element (100), preparing the measurement results for transmitting, transmitting (120) the measurement results from the at least partially submerged system element (100), receiving said measurement results at a receiving system element (200), and determining an acceptable draft for a ship for safe navigation through said navigable passage (400) based on the measurement results and ship specific properties.