@SN954
Could you say if you use the Route planner on Windy website or in the mobile app ?
I guess you use the website.
First you need to set the speed and turn it ON. On the timeline, you can move and change the departure date/hour. Then hover the forecast panel to see the position of the mobile and to move it, weather conditions changing accordingly.
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The round icon shows the mobile position, not a boat icon, because the Route planner is also used for flights.