You should create an event which represents your boat/animal/whatever and either assign a Movement Route to it (set the Movement Type to 'By It's Route' to do so) or let it move with the 'Move Event'-command. The first task within the Move Route should be 'Start Slip Trough' to make the object ignore the non-passability of the water. To make the event disappear, activate a Switch ('Switch ON') at the end of the Move Route. Then create a second page for the event you like to move, select the switch you set ON as a condition for the event (on the left page of the event editor) and set the graphic to the empty icon which should be the first picture of your chipset's upper layer.Zitat von Rizzler
edit: clarified terminology