The duck says that unless you like swimming like a duck, don't go to the posted coordinates, but solve the puzzle for a keyword to obtain the final coordinates.
The duck also says
पक पक : prääk prääk : кря-кря : κουάκ κουάκ : kwaak : braaaq caaq : kvack kvack : quack! : mac mac
You can validate your puzzle solution with
certitude.