This is the 17253rd most frequent Russian word.
судном
"Судном" (instrumental case of "судно") means "by/with a vessel or ship."
In this sentence, 'судном' is used in the instrumental case of the word 'судно,' meaning 'vessel' or 'boat,' referring to the means by which the action is carried out.
Мы путешествовали на маленьком судном вдоль побережья.
We traveled on a small vessel along the coast.
Here, 'судна' is in the genitive case, indicating possession or use by the noun it modifies, referring to a specific 'vessel.'
Он был владельцем старого судна, использовавшегося для рыболовства.
He was the owner of an old vessel used for fishing.
The word 'судне' is in the prepositional case, showing location or place, referring to the inside or onboard the 'vessel.'