This is the 6142nd most frequent Russian word.
судами
"Судами" means "by ships" or "by vessels" in English.
In this sentence, 'судами' is the instrumental plural form of 'судно', meaning 'ships', and is used to describe how an action (propelled) is performed with the wind on the ships.
Судами движет ветер.
The ships are propelled by the wind.
Here, 'судами' also represents 'ships' in an instrumental plural form, emphasizing the objects of the activities occurring in or around the port.
Люди занимаются судами в порту.
People are working with the ships in the port.
In this usage, 'судами' remains instrumental plural but now describes a relational context, illustrating that the race occurs involving multiple ships.