Incorrect player position while in a boat

While in a LAN game session (i don't know, maybe this also affects internet game server) boats are glitching. Player gets in a boat, swims approx. 30-50 meters and then he is displayed to other players as if he was standing on the same place, where he got into a boat. Boat is also displayed without player, but it is fully controlable. And for the player, who currently is in a boat, everything looks ok.